<?xml version="1.0" encoding="US-ASCII"?>
<!-- DFIN New ActiveDisclosure (SM) XBRL Schema Document - http://www.dfinsolutions.com/ -->
<!-- Creation Date :2023-08-14T13:29:32.8180+00:00 -->
<!-- Copyright (c) 2023 Donnelly Financial Solutions, Inc. All Rights Reserved. -->
<xsd:schema targetNamespace="http://www.definitivehc.com/20221231" attributeFormDefault="unqualified" elementFormDefault="qualified" xmlns:country="http://xbrl.sec.gov/country/2022" xmlns:dtr-types="http://www.xbrl.org/dtr/type/2020-01-21" xmlns:enum2="http://xbrl.org/2020/extensible-enumerations-2.0" xmlns:srt="http://fasb.org/srt/2022" xmlns:dh="http://www.definitivehc.com/20221231" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:us-gaap="http://fasb.org/us-gaap/2022" xmlns:dei="http://xbrl.sec.gov/dei/2022" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:xlink="http://www.w3.org/1999/xlink">
  <xsd:import schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd" namespace="http://www.xbrl.org/2003/instance"/>
  <xsd:import schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" namespace="http://www.xbrl.org/2003/linkbase"/>
  <xsd:import schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd" namespace="http://xbrl.org/2005/xbrldt"/>
  <xsd:import schemaLocation="https://www.xbrl.org/2020/extensible-enumerations-2.0.xsd" namespace="http://xbrl.org/2020/extensible-enumerations-2.0"/>
  <xsd:import schemaLocation="https://xbrl.sec.gov/dei/2022/dei-2022.xsd" namespace="http://xbrl.sec.gov/dei/2022"/>
  <xsd:import schemaLocation="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd" namespace="http://fasb.org/us-gaap/2022"/>
  <xsd:import schemaLocation="https://xbrl.sec.gov/country/2022/country-2022.xsd" namespace="http://xbrl.sec.gov/country/2022"/>
  <xsd:import schemaLocation="https://www.xbrl.org/dtr/type/2020-01-21/types.xsd" namespace="http://www.xbrl.org/dtr/type/2020-01-21"/>
  <xsd:import schemaLocation="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd" namespace="http://fasb.org/srt/2022"/>
  <xsd:annotation>
    <xsd:appinfo>
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="dh-20221231_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:title="Labels link" xlink:type="simple"/>
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="dh-20221231_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:title="Presentation link" xlink:type="simple"/>
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="dh-20221231_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:title="Definition link" xlink:type="simple"/>
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="dh-20221231_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:title="Calculation link" xlink:type="simple"/>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DocumentDocumentAndEntityInformation" id="Role_DocumentDocumentAndEntityInformation">
        <link:definition>100000 - Document - Document and Entity Information</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/StatementConsolidatedBalanceSheets" id="StatementConsolidatedBalanceSheets">
        <link:definition>100010 - Statement - CONSOLIDATED BALANCE SHEETS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureAcquisitionsAndInvestmentsSummaryOfTransactionTransferredDetails2" id="DisclosureAcquisitionsAndInvestmentsSummaryOfTransactionTransferredDetails2">
        <link:definition>100020 - Disclosure - Acquisitions and Investments - Summary of Transaction Transferred (Details) 2</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureCommitmentsAndContingenciesScheduleOfEstimatedAnnualMinimumPurchaseCommitmentsDetails2" id="DisclosureCommitmentsAndContingenciesScheduleOfEstimatedAnnualMinimumPurchaseCommitmentsDetails2">
        <link:definition>100030 - Disclosure - Commitments and Contingencies - Schedule of Estimated Annual Minimum Purchase Commitments (Details) 2</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureIncomeTaxesScheduleOfComponentsOfDeferredTaxAssetsAndLiabilityDetails2" id="DisclosureIncomeTaxesScheduleOfComponentsOfDeferredTaxAssetsAndLiabilityDetails2">
        <link:definition>100040 - Disclosure - Income Taxes - Schedule of Components of Deferred Tax Assets And Liability (Details) 2</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureLeasesScheduleOfOperatingLeaseLiabilitiesDetails2" id="DisclosureLeasesScheduleOfOperatingLeaseLiabilitiesDetails2">
        <link:definition>100050 - Disclosure - Leases - Schedule of operating lease liabilities (Details) 2</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/StatementConsolidatedBalanceSheetsParenthetical" id="StatementConsolidatedBalanceSheetsParenthetical">
        <link:definition>100060 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/StatementConsolidatedStatementsOfCashFlows2" id="StatementConsolidatedStatementsOfCashFlows2">
        <link:definition>100070 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS 2</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/StatementConsolidatedStatementsOfOperations" id="StatementConsolidatedStatementsOfOperations">
        <link:definition>100080 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/StatementConsolidatedStatementsOfComprehensiveLoss" id="StatementConsolidatedStatementsOfComprehensiveLoss">
        <link:definition>100090 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/StatementConsolidatedStatementsOfChangesInMembersEquityAndTotalEquity" id="StatementConsolidatedStatementsOfChangesInMembersEquityAndTotalEquity">
        <link:definition>100100 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN MEMBERS' EQUITY AND TOTAL EQUITY</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/StatementConsolidatedStatementsOfChangesInMembersEquityAndTotalEquityParenthetical" id="StatementConsolidatedStatementsOfChangesInMembersEquityAndTotalEquityParenthetical">
        <link:definition>100110 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN MEMBERS' EQUITY AND TOTAL EQUITY (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_StatementCONSOLIDATEDSTATEMENTSOFCASHFLOWS" id="Role_StatementCONSOLIDATEDSTATEMENTSOFCASHFLOWS">
        <link:definition>100120 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureDescriptionOfBusiness" id="Role_DisclosureDescriptionOfBusiness">
        <link:definition>100130 - Disclosure - Description of Business</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPolicies" id="Role_DisclosureSummaryOfSignificantAccountingPolicies">
        <link:definition>100140 - Disclosure - Summary of Significant Accounting Policies</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureRestatementOfPreviouslyIssuedFinancialStatements" id="DisclosureRestatementOfPreviouslyIssuedFinancialStatements">
        <link:definition>100150 - Disclosure - Restatement of Previously Issued Financial Statements</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureAcquisitionsAndInvestments" id="DisclosureAcquisitionsAndInvestments">
        <link:definition>100160 - Disclosure - Acquisitions and Investments</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureRevenue" id="Role_DisclosureRevenue">
        <link:definition>100170 - Disclosure - Revenue</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureLeases" id="DisclosureLeases">
        <link:definition>100180 - Disclosure - Leases</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureShorttermInvestments" id="DisclosureShorttermInvestments">
        <link:definition>100190 - Disclosure - Short-term Investments</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureAccountsReceivable" id="Role_DisclosureAccountsReceivable">
        <link:definition>100200 - Disclosure - Accounts Receivable</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosurePropertyAndEquipment" id="Role_DisclosurePropertyAndEquipment">
        <link:definition>100210 - Disclosure - Property and Equipment</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureGoodwillAndIntangibleAssets" id="Role_DisclosureGoodwillAndIntangibleAssets">
        <link:definition>100220 - Disclosure - Goodwill and Intangible Assets</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureLongTermDebt" id="Role_DisclosureLongTermDebt">
        <link:definition>100230 - Disclosure - Long Term Debt</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureDerivativeInstrumentsAndHedgingActivities" id="DisclosureDerivativeInstrumentsAndHedgingActivities">
        <link:definition>100240 - Disclosure - Derivative Instruments and Hedging Activities</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureFairValueMeasurements" id="Role_DisclosureFairValueMeasurements">
        <link:definition>100250 - Disclosure - Fair Value Measurements</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureAccruedExpensesAndOtherCurrentLiabilities" id="Role_DisclosureAccruedExpensesAndOtherCurrentLiabilities">
        <link:definition>100260 - Disclosure - Accrued Expenses and Other Current Liabilities</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureCommitmentsAndContingencies" id="Role_DisclosureCommitmentsAndContingencies">
        <link:definition>100270 - Disclosure - Commitments and Contingencies</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureAccumulatedOtherComprehensiveIncome" id="DisclosureAccumulatedOtherComprehensiveIncome">
        <link:definition>100280 - Disclosure - Accumulated Other Comprehensive Income</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureStockholdersEquityAndMembersEquity" id="Role_DisclosureStockholdersEquityAndMembersEquity">
        <link:definition>100290 - Disclosure - Stockholders' Equity and Members' Equity</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureEquityBasedCompensation" id="Role_DisclosureEquityBasedCompensation">
        <link:definition>100300 - Disclosure - Equity-based Compensation</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureRetirementPlan" id="Role_DisclosureRetirementPlan">
        <link:definition>100310 - Disclosure - Retirement Plan</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureIncomeTaxes" id="Role_DisclosureIncomeTaxes">
        <link:definition>100320 - Disclosure - Income Taxes</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureLossPerShare1" id="DisclosureLossPerShare1">
        <link:definition>100330 - Disclosure - Loss Per Share</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureSegmentAndGeographicData" id="Role_DisclosureSegmentAndGeographicData">
        <link:definition>100340 - Disclosure - Segment and Geographic Data</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureRelatedParties" id="Role_DisclosureRelatedParties">
        <link:definition>100350 - Disclosure - Related Parties</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureQuarterlyResultsOfOperations" id="DisclosureQuarterlyResultsOfOperations">
        <link:definition>100360 - Disclosure - Quarterly Results of Operations</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureSubsequentEvents" id="Role_DisclosureSubsequentEvents">
        <link:definition>100370 - Disclosure - Subsequent Events</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesPolicies" id="Role_DisclosureSummaryOfSignificantAccountingPoliciesPolicies">
        <link:definition>100380 - Disclosure - Summary of Significant Accounting Policies (Policies)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesTables" id="DisclosureSummaryOfSignificantAccountingPoliciesTables">
        <link:definition>100390 - Disclosure - Summary of Significant Accounting Policies (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureRestatementOfPreviouslyIssuedFinancialStatementsTables" id="DisclosureRestatementOfPreviouslyIssuedFinancialStatementsTables">
        <link:definition>100400 - Disclosure - Restatement of Previously Issued Financial Statements (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureAcquisitionsAndInvestmentsTables" id="DisclosureAcquisitionsAndInvestmentsTables">
        <link:definition>100410 - Disclosure - Acquisitions and Investments (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureRevenueTables" id="Role_DisclosureRevenueTables">
        <link:definition>100420 - Disclosure - Revenue (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureLeasesTables" id="DisclosureLeasesTables">
        <link:definition>100430 - Disclosure - Leases (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureShorttermInvestmentsTables" id="DisclosureShorttermInvestmentsTables">
        <link:definition>100440 - Disclosure - Short-term Investments (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureAccountsReceivableTables" id="DisclosureAccountsReceivableTables">
        <link:definition>100450 - Disclosure - Accounts Receivable (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosurePropertyAndEquipmentTable" id="Role_DisclosurePropertyAndEquipmentTable">
        <link:definition>100460 - Disclosure - Property and Equipment (Table)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureGoodwillAndIntangibleAssetsTables" id="Role_DisclosureGoodwillAndIntangibleAssetsTables">
        <link:definition>100470 - Disclosure - Goodwill and Intangible Assets (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureLongTermDebtTables" id="Role_DisclosureLongTermDebtTables">
        <link:definition>100480 - Disclosure - Long Term Debt (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureDerivativeInstrumentsAndHedgingActivitiesTables" id="DisclosureDerivativeInstrumentsAndHedgingActivitiesTables">
        <link:definition>100490 - Disclosure - Derivative Instruments and Hedging Activities (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureFairValueMeasurementsTables" id="Role_DisclosureFairValueMeasurementsTables">
        <link:definition>100500 - Disclosure - Fair Value Measurements (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureAccruedExpensesAndOtherCurrentLiabilitiesTables" id="Role_DisclosureAccruedExpensesAndOtherCurrentLiabilitiesTables">
        <link:definition>100510 - Disclosure - Accrued Expenses and Other Current Liabilities (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureCommitmentsAndContingenciesTables" id="Role_DisclosureCommitmentsAndContingenciesTables">
        <link:definition>100520 - Disclosure - Commitments and Contingencies (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureAccumulatedOtherComprehensiveIncomeTables" id="DisclosureAccumulatedOtherComprehensiveIncomeTables">
        <link:definition>100530 - Disclosure - Accumulated Other Comprehensive Income (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureStockholdersEquityAndMembersEquityTables" id="Role_DisclosureStockholdersEquityAndMembersEquityTables">
        <link:definition>100540 - Disclosure - Stockholders' Equity and Members' Equity (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureEquitybasedCompensationTables" id="DisclosureEquitybasedCompensationTables">
        <link:definition>100550 - Disclosure - Equity-based Compensation (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureIncomeTaxesTables" id="Role_DisclosureIncomeTaxesTables">
        <link:definition>100560 - Disclosure - Income Taxes (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureLossPerShareTables" id="DisclosureLossPerShareTables">
        <link:definition>100570 - Disclosure - Loss Per Share (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureSegmentAndGeographicDataTables" id="DisclosureSegmentAndGeographicDataTables">
        <link:definition>100580 - Disclosure - Segment and Geographic Data (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureQuarterlyResultsOfOperationsTables" id="DisclosureQuarterlyResultsOfOperationsTables">
        <link:definition>100590 - Disclosure - Quarterly Results of Operations (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureDescriptionOfBusinessAdditionalInformationDetails" id="DisclosureDescriptionOfBusinessAdditionalInformationDetails">
        <link:definition>100600 - Disclosure - Description of Business - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformationDetails" id="Role_DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformationDetails">
        <link:definition>100610 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesScheduleOfPropertyPlantAndEquipmentDepreciatedOnStraightLineBasisDetails" id="DisclosureSummaryOfSignificantAccountingPoliciesScheduleOfPropertyPlantAndEquipmentDepreciatedOnStraightLineBasisDetails">
        <link:definition>100620 - Disclosure - Summary of Significant Accounting Policies - Schedule of Property, Plant, and Equipment Depreciated on Straight - Line Basis (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesScheduleOfEstimatedUsefulLivesOfTheAssetsDetails" id="DisclosureSummaryOfSignificantAccountingPoliciesScheduleOfEstimatedUsefulLivesOfTheAssetsDetails">
        <link:definition>100630 - Disclosure - Summary of Significant Accounting Policies - Schedule of Estimated Useful Lives of the Assets (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureRestatementOfPreviouslyIssuedFinancialStatementsAdditionalInformationDetails" id="DisclosureRestatementOfPreviouslyIssuedFinancialStatementsAdditionalInformationDetails">
        <link:definition>100640 - Disclosure - Restatement of Previously Issued Financial Statements - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureRestatementOfPreviouslyIssuedFinancialStatementsScheduleOfSummaryOfEffectOfRestatementItemDetails" id="DisclosureRestatementOfPreviouslyIssuedFinancialStatementsScheduleOfSummaryOfEffectOfRestatementItemDetails">
        <link:definition>100650 - Disclosure - Restatement of Previously Issued Financial Statements - Schedule of summary of effect of restatement item (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureRestatementOfPreviouslyIssuedFinancialStatementsScheduleOfCorrectionsInTheConsolidatedStatementsOfOperationsDetails" id="DisclosureRestatementOfPreviouslyIssuedFinancialStatementsScheduleOfCorrectionsInTheConsolidatedStatementsOfOperationsDetails">
        <link:definition>100660 - Disclosure - Restatement of Previously Issued Financial Statements - Schedule of Corrections in the Consolidated Statements of Operations (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureRestatementOfPreviouslyIssuedFinancialStatementsScheduleOfCorrectionsInTheConsolidatedBalanceSheetsDetails" id="DisclosureRestatementOfPreviouslyIssuedFinancialStatementsScheduleOfCorrectionsInTheConsolidatedBalanceSheetsDetails">
        <link:definition>100670 - Disclosure - Restatement of Previously Issued Financial Statements - Schedule of Corrections in the consolidated balance sheets (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureRestatementOfPreviouslyIssuedFinancialStatementsScheduleOfCorrectionsInTheConsolidatedStatementsOfMembersEquityAndTotalEquityDet" id="DisclosureRestatementOfPreviouslyIssuedFinancialStatementsScheduleOfCorrectionsInTheConsolidatedStatementsOfMembersEquityAndTotalEquityDet">
        <link:definition>100680 - Disclosure - Restatement of Previously Issued Financial Statements - Schedule of Corrections in the consolidated statements of members' equity and total equity (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureRestatementOfPreviouslyIssuedFinancialStatementsScheduleOfCorrectionsInTheConsolidatedStatementsOfCashFlowsDetails" id="DisclosureRestatementOfPreviouslyIssuedFinancialStatementsScheduleOfCorrectionsInTheConsolidatedStatementsOfCashFlowsDetails">
        <link:definition>100690 - Disclosure - Restatement of Previously Issued Financial Statements - Schedule of Corrections in the Consolidated Statements of Cash Flows (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureConsolidatedChangesInMembersEquityAndTotalEquityDetails" id="DisclosureConsolidatedChangesInMembersEquityAndTotalEquityDetails">
        <link:definition>100700 - Disclosure - Consolidated Changes in Member's Equity and Total Equity (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureAcquisitionsAndInvestmentsAdditionalInformationDetails" id="DisclosureAcquisitionsAndInvestmentsAdditionalInformationDetails">
        <link:definition>100710 - Disclosure - Acquisitions and Investments - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureAcquisitionsAndInvestmentsSummaryOfTransactionTransferredDetails" id="DisclosureAcquisitionsAndInvestmentsSummaryOfTransactionTransferredDetails">
        <link:definition>100720 - Disclosure - Acquisitions and Investments - Summary of Transaction Transferred (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureAcquisitionsAndInvestmentsSummaryOfAllocationOfPurchasePriceToTheFairValueOfAssetsAcquiredDetails" id="DisclosureAcquisitionsAndInvestmentsSummaryOfAllocationOfPurchasePriceToTheFairValueOfAssetsAcquiredDetails">
        <link:definition>100730 - Disclosure - Acquisitions and Investments - Summary of Allocation of Purchase Price to the Fair Value of Assets Acquired (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureAcquisitionsAndInvestmentsScheduleOfBusinessAcquisitionProFormaInformationDetails" id="DisclosureAcquisitionsAndInvestmentsScheduleOfBusinessAcquisitionProFormaInformationDetails">
        <link:definition>100740 - Disclosure - Acquisitions and Investments - Schedule of Business Acquisition, Pro Forma Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureRevenueScheduleOfDisaggregationOfRevenueDetails" id="Role_DisclosureRevenueScheduleOfDisaggregationOfRevenueDetails">
        <link:definition>100750 - Disclosure - Revenue - Schedule of Disaggregation of Revenue (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureRevenueSummaryOfReceivablesDeferredContractCostsAndContractLiabilitiesFromContractWithCustomersDetails" id="Role_DisclosureRevenueSummaryOfReceivablesDeferredContractCostsAndContractLiabilitiesFromContractWithCustomersDetails">
        <link:definition>100760 - Disclosure - Revenue - Summary of Receivables, Deferred Contract Costs and Contract Liabilities from Contract with Customers (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureRevenueSummaryOfDeferredContractCostsDetails" id="Role_DisclosureRevenueSummaryOfDeferredContractCostsDetails">
        <link:definition>100770 - Disclosure - Revenue - Summary of Deferred Contract Costs (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureRevenueSummaryOfDeferredRevenueBalancesDetails" id="Role_DisclosureRevenueSummaryOfDeferredRevenueBalancesDetails">
        <link:definition>100780 - Disclosure - Revenue - Summary of Deferred Revenue Balances (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureRevenueSummaryOfRemainingPerformanceObligationDetails" id="Role_DisclosureRevenueSummaryOfRemainingPerformanceObligationDetails">
        <link:definition>100790 - Disclosure - Revenue - Summary of Remaining Performance Obligation (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureLeasesAdditionalInformationDetails" id="DisclosureLeasesAdditionalInformationDetails">
        <link:definition>100800 - Disclosure - Leases - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureLeasesScheduleOfLeaseCostsDetails" id="DisclosureLeasesScheduleOfLeaseCostsDetails">
        <link:definition>100810 - Disclosure - Leases - Schedule of lease costs (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureLeasesSupplementalCashFlowInformationRelatedToLeasesDetails" id="DisclosureLeasesSupplementalCashFlowInformationRelatedToLeasesDetails">
        <link:definition>100820 - Disclosure - Leases - Supplemental cash flow information related to leases (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureLeasesScheduleOfLeaseTermAndDiscountRateDetails" id="DisclosureLeasesScheduleOfLeaseTermAndDiscountRateDetails">
        <link:definition>100830 - Disclosure - Leases - Schedule of lease term and discount rate (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureLeasesScheduleOfOperatingLeaseLiabilitiesDetails" id="DisclosureLeasesScheduleOfOperatingLeaseLiabilitiesDetails">
        <link:definition>100840 - Disclosure - Leases - Schedule of operating lease liabilities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureLeasesScheduleOfMaturitiesOfLeaseLiabilitiesDetails" id="DisclosureLeasesScheduleOfMaturitiesOfLeaseLiabilitiesDetails">
        <link:definition>100850 - Disclosure - Leases - Schedule of maturities of lease liabilities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureShorttermInvestmentsScheduleOfShorttermInvestmentsDetails" id="DisclosureShorttermInvestmentsScheduleOfShorttermInvestmentsDetails">
        <link:definition>100860 - Disclosure - Short-term Investments - Schedule of short-term Investments (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureAccountsReceivableScheduleOfAccountsReceivableDetails" id="DisclosureAccountsReceivableScheduleOfAccountsReceivableDetails">
        <link:definition>100870 - Disclosure - Accounts Receivable - Schedule of Accounts Receivable (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosurePropertyAndEquipmentScheduleOfPropertyAndEquipmentDetails" id="Role_DisclosurePropertyAndEquipmentScheduleOfPropertyAndEquipmentDetails">
        <link:definition>100880 - Disclosure - Property and Equipment - Schedule of Property and Equipment (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosurePropertyAndEquipmentAdditionalInformationDetails" id="Role_DisclosurePropertyAndEquipmentAdditionalInformationDetails">
        <link:definition>100890 - Disclosure - Property and Equipment - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureGoodwillAndIntangibleAssetsScheduleOfIntangibleAssetsAndGoodwillDetails" id="Role_DisclosureGoodwillAndIntangibleAssetsScheduleOfIntangibleAssetsAndGoodwillDetails">
        <link:definition>100900 - Disclosure - Goodwill and Intangible Assets - Schedule of Intangible Assets and Goodwill (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureGoodwillAndIntangibleAssetsAdditionalInformationDetails" id="Role_DisclosureGoodwillAndIntangibleAssetsAdditionalInformationDetails">
        <link:definition>100910 - Disclosure - Goodwill and Intangible Assets - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureGoodwillAndIntangibleAssetsScheduleOfFutureAmortizationExpenseDetails" id="Role_DisclosureGoodwillAndIntangibleAssetsScheduleOfFutureAmortizationExpenseDetails">
        <link:definition>100920 - Disclosure - Goodwill and Intangible Assets - Schedule of Future Amortization Expense (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureGoodwillAndIntangibleAssetsScheduleOfChangesInCarryingAmountOfGoodwillDetails" id="Role_DisclosureGoodwillAndIntangibleAssetsScheduleOfChangesInCarryingAmountOfGoodwillDetails">
        <link:definition>100930 - Disclosure - Goodwill and Intangible Assets - Schedule of Changes in the Carrying Amount of Goodwill (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureLongTermDebtScheduleOfLongTermDebtDetails" id="Role_DisclosureLongTermDebtScheduleOfLongTermDebtDetails">
        <link:definition>100940 - Disclosure - Long-Term Debt - Schedule of Long-term Debt (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureLongTermDebtAdditionalInformationDetails" id="Role_DisclosureLongTermDebtAdditionalInformationDetails">
        <link:definition>100950 - Disclosure - Long-Term Debt - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureLongTermDebtScheduleOfDebtDetails" id="Role_DisclosureLongTermDebtScheduleOfDebtDetails">
        <link:definition>100960 - Disclosure - Long Term Debt - Schedule of Debt (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureDerivativeInstrumentsAndHedgingActivitiesAdditionalInformationDetails" id="DisclosureDerivativeInstrumentsAndHedgingActivitiesAdditionalInformationDetails">
        <link:definition>100970 - Disclosure - Derivative Instruments and Hedging Activities - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureDerivativeInstrumentsAndHedgingActivitiesSummaryOfFairValuesOfTheInterestRateSwapDetails" id="DisclosureDerivativeInstrumentsAndHedgingActivitiesSummaryOfFairValuesOfTheInterestRateSwapDetails">
        <link:definition>100980 - Disclosure - Derivative Instruments and Hedging Activities - Summary of Fair Values of the Interest Rate Swap (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureFairValueMeasurementsAdditionalInformationDetails" id="Role_DisclosureFairValueMeasurementsAdditionalInformationDetails">
        <link:definition>100990 - Disclosure - Fair Value Measurements - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureFairValueMeasurementsScheduleOfReconciliationOfEarnoutLiabilitiesMeasuredAtFairValueOnRecurringBasisUnobservableInputsDetails" id="Role_DisclosureFairValueMeasurementsScheduleOfReconciliationOfEarnoutLiabilitiesMeasuredAtFairValueOnRecurringBasisUnobservableInputsDetails">
        <link:definition>101000 - Disclosure - Fair Value Measurements - Schedule of Reconciliation of Earnout Liabilities Measured at Fair Value on a Recurring Basis Unobservable Inputs (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureFairValueMeasurementsScheduleOfFairValueOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" id="DisclosureFairValueMeasurementsScheduleOfFairValueOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails">
        <link:definition>101010 - Disclosure - Fair Value Measurements - Schedule of Fair Value of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureAccuredExpensesAndOtherCurrenetLiabilitiesAdditionalInformationDetails" id="DisclosureAccuredExpensesAndOtherCurrenetLiabilitiesAdditionalInformationDetails">
        <link:definition>101020 - Disclosure - Accured Expenses and Other Currenet Liabilities - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureAccruedExpensesAndOtherCurrentLiabilitiesScheduleOfAccruedExpensesAndOtherCurrentLiabilitiesDetails" id="Role_DisclosureAccruedExpensesAndOtherCurrentLiabilitiesScheduleOfAccruedExpensesAndOtherCurrentLiabilitiesDetails">
        <link:definition>101030 - Disclosure - Accrued Expenses and Other Current Liabilities - Schedule of Accrued Expenses And Other Current Liabilities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureCommitmentsAndContingenciesAdditionalInformationDetails" id="Role_DisclosureCommitmentsAndContingenciesAdditionalInformationDetails">
        <link:definition>101040 - Disclosure - Commitments and Contingencies - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureCommitmentsAndContingenciesScheduleOfEstimatedAnnualMinimumPurchaseCommitmentsDetails" id="DisclosureCommitmentsAndContingenciesScheduleOfEstimatedAnnualMinimumPurchaseCommitmentsDetails">
        <link:definition>101050 - Disclosure - Commitments and Contingencies - Schedule of Estimated Annual Minimum Purchase Commitments (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureAccumulatedOtherComprehensiveIncomeSummaryOfChangesInAccumulatedBalancesInOtherComprehensiveIncomeDetails" id="DisclosureAccumulatedOtherComprehensiveIncomeSummaryOfChangesInAccumulatedBalancesInOtherComprehensiveIncomeDetails">
        <link:definition>101060 - Disclosure - Accumulated Other Comprehensive Income - Summary of Changes in Accumulated Balances in Other Comprehensive Income (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureStockholdersEquityAndMembersEquityAdditionalInformationDetails" id="Role_DisclosureStockholdersEquityAndMembersEquityAdditionalInformationDetails">
        <link:definition>101070 - Disclosure - Stockholders' Equity and Members' Equity - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureStockholdersEquityAndMembersEquitySummaryOfClassOfStockDetails" id="Role_DisclosureStockholdersEquityAndMembersEquitySummaryOfClassOfStockDetails">
        <link:definition>101080 - Disclosure - Stockholders' Equity and Members' Equity - Summary of Class of Stock (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureEquityBasedCompensationSummaryOfEquityBasedCompensationExpenseRecognizedDetails" id="Role_DisclosureEquityBasedCompensationSummaryOfEquityBasedCompensationExpenseRecognizedDetails">
        <link:definition>101090 - Disclosure - Equity-based Compensation - Summary of Equity Based Compensation Expense Recognized (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureEquitybasedCompensationAdditionalInformationDetails" id="DisclosureEquitybasedCompensationAdditionalInformationDetails">
        <link:definition>101100 - Disclosure - Equity-based Compensation - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureEquitybasedCompensationScheduleOfCompanysUnvestedTimebasedAndPerformancebasedUnitActivityDetail" id="DisclosureEquitybasedCompensationScheduleOfCompanysUnvestedTimebasedAndPerformancebasedUnitActivityDetail">
        <link:definition>101110 - Disclosure - Equity-based Compensation - Schedule of Company's Unvested Time-Based and Performance-Based Unit Activity (Detail)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureRetirementPlansAdditionalInformationDetails" id="Role_DisclosureRetirementPlansAdditionalInformationDetails">
        <link:definition>101120 - Disclosure - Retirement Plans - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureIncomeTaxesScheduleComponentsOfIncomeBeforeIncomeTaxesDetails" id="DisclosureIncomeTaxesScheduleComponentsOfIncomeBeforeIncomeTaxesDetails">
        <link:definition>101130 - Disclosure - Income Taxes - Schedule Components of Income Before Income Taxes (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureIncomeTaxesScheduleOfComponentsOfIncomeTaxProvisionDetails" id="Role_DisclosureIncomeTaxesScheduleOfComponentsOfIncomeTaxProvisionDetails">
        <link:definition>101140 - Disclosure - Income Taxes - Schedule of Components of Income Tax Provision (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureIncomeTaxesScheduleOfReconciliationOfFederalIncomeTaxRateToIncomeTaxRateDetails" id="Role_DisclosureIncomeTaxesScheduleOfReconciliationOfFederalIncomeTaxRateToIncomeTaxRateDetails">
        <link:definition>101150 - Disclosure - Income Taxes - Schedule of Reconciliation of the Federal Income Tax Rate To Income Tax Rate (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureIncomeTaxesScheduleOfComponentsOfDeferredTaxAssetsAndLiabilityDetails" id="DisclosureIncomeTaxesScheduleOfComponentsOfDeferredTaxAssetsAndLiabilityDetails">
        <link:definition>101160 - Disclosure - Income Taxes - Schedule of Components of Deferred Tax Assets And Liability (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureIncomeTaxesAdditionalInformationDetails" id="Role_DisclosureIncomeTaxesAdditionalInformationDetails">
        <link:definition>101170 - Disclosure - Income Taxes - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureLossPerShareScheduleOfNetLossPerShareBasicAndDilutedDetails" id="DisclosureLossPerShareScheduleOfNetLossPerShareBasicAndDilutedDetails">
        <link:definition>101180 - Disclosure - Loss Per Share - Schedule of Net Loss Per Share, Basic and Diluted (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureLossPerShareAdditionalInformationDetails" id="Role_DisclosureLossPerShareAdditionalInformationDetails">
        <link:definition>101190 - Disclosure - Loss Per Share - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureLossPerShareScheduleOfDilutiveSecuritiesExcludedFromComputationOfDilutedNetLossPerShareDetails" id="DisclosureLossPerShareScheduleOfDilutiveSecuritiesExcludedFromComputationOfDilutedNetLossPerShareDetails">
        <link:definition>101200 - Disclosure - Loss Per Share - Schedule of Dilutive Securities Excluded from Computation of Diluted Net loss Per Share (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureSegmentAndGeographicDataScheduleOfRevenueByGeographicAreasDetails" id="Role_DisclosureSegmentAndGeographicDataScheduleOfRevenueByGeographicAreasDetails">
        <link:definition>101210 - Disclosure - Segment and Geographic Data - Schedule of Revenue by Geographic Areas (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureSegmentAndGeographicDataScheduleOfLongLivedAssetsByGeographicAreasDetails" id="Role_DisclosureSegmentAndGeographicDataScheduleOfLongLivedAssetsByGeographicAreasDetails">
        <link:definition>101220 - Disclosure - Segment and Geographic Data - Schedule of Long-Lived Assets by Geographic Areas) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/Role_DisclosureRelatedPartiesAdditionalInformationDetails" id="Role_DisclosureRelatedPartiesAdditionalInformationDetails">
        <link:definition>101230 - Disclosure - Related parties - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.definitivehc.com/20221231/taxonomy/role/DisclosureSubsequentEventsAdditionalInformationDetails" id="DisclosureSubsequentEventsAdditionalInformationDetails">
        <link:definition>101240 - Disclosure - Subsequent Events - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
    </xsd:appinfo>
  </xsd:annotation>
  <xsd:element id="dh_IntangibleAssetsIncludingGoodwillGross" name="IntangibleAssetsIncludingGoodwillGross" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="dh_ClassBProfitInterestUnitsMember" name="ClassBProfitInterestUnitsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_RepurchaseOnNoncontrollingInterests" name="RepurchaseOnNoncontrollingInterests" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="dh_ComprehensiveIncomeLossAttributableToDefinitiveOpcoPriorToReorganizationTransactions" name="ComprehensiveIncomeLossAttributableToDefinitiveOpcoPriorToReorganizationTransactions" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="dh_AcquisitionOfLimitedLiabilityCompanyLlc" name="AcquisitionOfLimitedLiabilityCompanyLlc" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="dh_TwoThousandNineteenRevolvingLineOfCreditMember" name="TwoThousandNineteenRevolvingLineOfCreditMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_EquityInvestment" name="EquityInvestment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="dh_TaxReceivableAgreementLiabilityDecreasing" name="TaxReceivableAgreementLiabilityDecreasing" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="dh_AccruedExpensesAndOtherCurrentLiabilities" name="AccruedExpensesAndOtherCurrentLiabilities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="dh_TransactionIntegrationAndRestructuringExpenses" name="TransactionIntegrationAndRestructuringExpenses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="dh_OperatingLeaseRightOfUseAssetMember" name="OperatingLeaseRightOfUseAssetMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_WeightedAverageRemainingLeaseTermAbstract" name="WeightedAverageRemainingLeaseTermAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_AccruedExpensesContingentConsiderationCurrent" name="AccruedExpensesContingentConsiderationCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="dh_TwoThousandNineteenDelayedDrawTermLoanMember" name="TwoThousandNineteenDelayedDrawTermLoanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_DefinitiveOpcoMember" name="DefinitiveOpcoMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_ScheduleOfLeasesTermAndDiscountRateTableTextBlock" name="ScheduleOfLeasesTermAndDiscountRateTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="dh_PaidInKindInterestOnTwoThousandNineteenTermLoanMember" name="PaidInKindInterestOnTwoThousandNineteenTermLoanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_OfficeRelocationMember" name="OfficeRelocationMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_TimeBasedRestrictedStockUnitsMember" name="TimeBasedRestrictedStockUnitsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_TwoThousandAndNineteenAcquisitionsMember" name="TwoThousandAndNineteenAcquisitionsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_DataMember" name="DataMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_SalesTaxPolicyTextBlock" name="SalesTaxPolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="dh_AgencyBondsMember" name="AgencyBondsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_AgencyBondsMaturitiesLessThan90DaysMember" name="AgencyBondsMaturitiesLessThan90DaysMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_TaxReceivableAgreementRealizedTaxBenefitsPayableToRelatedPartiesPercent" name="TaxReceivableAgreementRealizedTaxBenefitsPayableToRelatedPartiesPercent" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="dh_TaxReceivableAgreementLiabilityIncreasingAdjustment" name="TaxReceivableAgreementLiabilityIncreasingAdjustment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="dh_TwoThousandNineteenEquityIncentivePlanMember" name="TwoThousandNineteenEquityIncentivePlanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_DeferredContractCosts" name="DeferredContractCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="dh_PurchaseOptionOwnershipPercentage" name="PurchaseOptionOwnershipPercentage" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="dh_CommonUnitsAuthorizedValue" name="CommonUnitsAuthorizedValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="dh_ComprehensiveIncomeNetOfTaxIncludingNonControllingInterests" name="ComprehensiveIncomeNetOfTaxIncludingNonControllingInterests" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="dh_AsReportedMember" name="AsReportedMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_DeferredContractCostsCurrentPortion" name="DeferredContractCostsCurrentPortion" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="dh_TaxReceivableAgreementBenefitPercentage" name="TaxReceivableAgreementBenefitPercentage" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="dh_LimitedLiabilityCompanyLlcMembersEquityUnitBasedCompensationAndStockCompensation" name="LimitedLiabilityCompanyLlcMembersEquityUnitBasedCompensationAndStockCompensation" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="dh_GoodwillAndIntangibleAssetsMember" name="GoodwillAndIntangibleAssetsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_NetIncomeLossAttributableToDefinitiveOpcoPriorToReorganizationTransactions" name="NetIncomeLossAttributableToDefinitiveOpcoPriorToReorganizationTransactions" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="dh_PurchaseOptionMember" name="PurchaseOptionMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_MonoclAcquisitionMember" name="MonoclAcquisitionMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_DeferredRevenuePolicyTextBlock" name="DeferredRevenuePolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="dh_InitialEffectOfTheReorganizationTransactionsShare" name="InitialEffectOfTheReorganizationTransactionsShare" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="dh_RestructuringplanMember" name="RestructuringplanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_SummaryOfTransactionTransferredTableTextBlock" name="SummaryOfTransactionTransferredTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="dh_DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformationDetailsLineItems" name="DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformationDetailsLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_LimitedLiabilityCompanyLlcMembersEquityUnitBasedCompensationShares" name="LimitedLiabilityCompanyLlcMembersEquityUnitBasedCompensationShares" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="dh_ContingentConsiderationMember" name="ContingentConsiderationMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_RepaymentOfLongTermDebtFromIpoProceeds" name="RepaymentOfLongTermDebtFromIpoProceeds" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="dh_CapitalUnitsAuthorizedIssuedAndOutstanding" name="CapitalUnitsAuthorizedIssuedAndOutstanding" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="dh_SubscriptionServicesMember" name="SubscriptionServicesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_TaxReceivableAgreementsLiabilityNetOfCurrentPortion" name="TaxReceivableAgreementsLiabilityNetOfCurrentPortion" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="dh_WeightedAverageEarningsPerShareBasicAndDilutedOtherDisclosuresAbstract" name="WeightedAverageEarningsPerShareBasicAndDilutedOtherDisclosuresAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_TwoThousandFortyThroughTwoThousandFortyTwoMember" name="TwoThousandFortyThroughTwoThousandFortyTwoMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_ReportingUnitFairValueExceededRelatedCarryingValue" name="ReportingUnitFairValueExceededRelatedCarryingValue" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="dh_LegacyClassBUnitsMember" name="LegacyClassBUnitsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_NonCashPortionOfGainsLossesOnExtinguishmentOfDebt" name="NonCashPortionOfGainsLossesOnExtinguishmentOfDebt" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="dh_CommercialPaperMaturitiesLessThan90DaysMember" name="CommercialPaperMaturitiesLessThan90DaysMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseRightOfUseLiability" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseRightOfUseLiability" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="dh_PerformanceBasedMember" name="PerformanceBasedMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_CapitalContribution" name="CapitalContribution" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="dh_CapitalizedFinancingCosts" name="CapitalizedFinancingCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="dh_MonoclMember" name="MonoclMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_IntangibleAssetsIncludingGoodwillAccumulatedAmortization" name="IntangibleAssetsIncludingGoodwillAccumulatedAmortization" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="dh_WorkingCapitalAdjustments" name="WorkingCapitalAdjustments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="dh_AssetAcquisitionConsiderationTransferredInitialCashInvestment" name="AssetAcquisitionConsiderationTransferredInitialCashInvestment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="dh_DefinitiveHealthcareCorpMember" name="DefinitiveHealthcareCorpMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_VestedIncentiveUnitsValue" name="VestedIncentiveUnitsValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="dh_PerformanceBasedRsusMember" name="PerformanceBasedRsusMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_CommonStockCapitalSharesUnderwritersReservedForSaleAtIpo" name="CommonStockCapitalSharesUnderwritersReservedForSaleAtIpo" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="dh_PaymentForDistributionsToMembers" name="PaymentForDistributionsToMembers" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="dh_OriginalIssueDiscount" name="OriginalIssueDiscount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="dh_ChangesInContingentConsideration" name="ChangesInContingentConsideration" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="dh_EffectOfLlcUnitExchanges" name="EffectOfLlcUnitExchanges" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="dh_AnnualRecurringRevenue" name="AnnualRecurringRevenue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="dh_PercentageOfInstallmentAmount" name="PercentageOfInstallmentAmount" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="dh_SamuelAHamoodMember" name="SamuelAHamoodMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_TwoThousandTwentyOneRevolvingLineOfCreditMember" name="TwoThousandTwentyOneRevolvingLineOfCreditMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_ReclassificationMember" name="ReclassificationMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_OperatingLossCarryforwardsExpirationYear" name="OperatingLossCarryforwardsExpirationYear" type="xbrli:gYearItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="dh_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationNetChangeInFairValueAndOtherAdjustments" name="FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationNetChangeInFairValueAndOtherAdjustments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="dh_TimeBasedMember" name="TimeBasedMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_TotalLiabilityOnNetOperatingLossTaxadjustment" name="TotalLiabilityOnNetOperatingLossTaxadjustment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="dh_CapitalUnitsIssued" name="CapitalUnitsIssued" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="dh_MonoclHoldingCompanyMember" name="MonoclHoldingCompanyMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_CashPaidForAmountsIncludedInTheMeasurementOfLeaseLiabilitiesAbstract" name="CashPaidForAmountsIncludedInTheMeasurementOfLeaseLiabilitiesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_OfficeSpaceAndDataCenterFacilitiesMember" name="OfficeSpaceAndDataCenterFacilitiesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_DeferredContractCostsNetOfCurrentPortion" name="DeferredContractCostsNetOfCurrentPortion" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="dh_CertificatesOfDepositMaturitiesLessThan90DaysMember" name="CertificatesOfDepositMaturitiesLessThan90DaysMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_ScheduleOfFutureMinimumPaymentsForOperatingLeasesTableTextBlock" name="ScheduleOfFutureMinimumPaymentsForOperatingLeasesTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="dh_RevenueRemainingPerformanceObligationNonCurrent" name="RevenueRemainingPerformanceObligationNonCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="dh_StockIssuedDuringPeriodShareCommonStockUponVestingOfRestrictedStockUnit" name="StockIssuedDuringPeriodShareCommonStockUponVestingOfRestrictedStockUnit" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="dh_AnalyticalWizardsAcquisitionMember" name="AnalyticalWizardsAcquisitionMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_ProductDevelopmentMember" name="ProductDevelopmentMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_HIMSSAcquisitionMember" name="HIMSSAcquisitionMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_HSEAcquisitionMember" name="HSEAcquisitionMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_UnpaidEquityOfferingCostsIncludedInAccruedExpenses" name="UnpaidEquityOfferingCostsIncludedInAccruedExpenses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="dh_IncomeLossAttributableToNoncontrollingInterest1" name="IncomeLossAttributableToNoncontrollingInterest1" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="dh_EmployeeMember" name="EmployeeMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_RightOfUseAssetsMember" name="RightOfUseAssetsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_LeaseAndRentalExpenses" name="LeaseAndRentalExpenses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="dh_ProceedsFromMemberContributions" name="ProceedsFromMemberContributions" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="dh_VestedAndUnvestedUnitsMember" name="VestedAndUnvestedUnitsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_PercentageOfOwnership" name="PercentageOfOwnership" type="xbrli:pureItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="dh_DeferredTaxAssetsTaxReceivableAgreement" name="DeferredTaxAssetsTaxReceivableAgreement" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="dh_RepaymentsOnTermLoanAndDelayedDrawTermLoan" name="RepaymentsOnTermLoanAndDelayedDrawTermLoan" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="dh_StockIssuedDuringPeriodCommonStockUponVestingOfRestrictedStockUnit" name="StockIssuedDuringPeriodCommonStockUponVestingOfRestrictedStockUnit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="dh_RichardBoothMember" name="RichardBoothMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_TwoThousandTwentyTwoThroughIndefiniteMember" name="TwoThousandTwentyTwoThroughIndefiniteMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_IncomeTaxBenefitExpenseUnderGeneralAndAdministrativeExpense" name="IncomeTaxBenefitExpenseUnderGeneralAndAdministrativeExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="dh_TwoThousandAndTwentyAcquisitionsMember" name="TwoThousandAndTwentyAcquisitionsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_AllocationOfVestedIncentiveUnitsToNoncontrollingInterests" name="AllocationOfVestedIncentiveUnitsToNoncontrollingInterests" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="dh_DirectedShareProgramMember" name="DirectedShareProgramMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_FollowOnOfferingMember" name="FollowOnOfferingMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_UnamortizedFinancingCosts" name="UnamortizedFinancingCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="dh_InitialEffectOfTheReorganizationTransactions" name="InitialEffectOfTheReorganizationTransactions" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="dh_DefinitiveHoldcoMember" name="DefinitiveHoldcoMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_TwoThousandThirtyThroughIndefinitesMember" name="TwoThousandThirtyThroughIndefinitesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_ShareBasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfSharesParticipationThresholdAfterModification" name="ShareBasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfSharesParticipationThresholdAfterModification" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="dh_RestructuringChargesRelatedToOfficeLeases" name="RestructuringChargesRelatedToOfficeLeases" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="dh_ProceedsFromMaturitiesOfShortTermInvestments" name="ProceedsFromMaturitiesOfShortTermInvestments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="dh_BankOfAmericaNAMember" name="BankOfAmericaNAMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_ReorganizationTransactionsMember" name="ReorganizationTransactionsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_TwoThousandThirtySevenThroughIndefiniteMember" name="TwoThousandThirtySevenThroughIndefiniteMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_TechnologyMember" name="TechnologyMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_LegacyClassAUnitsMember" name="LegacyClassAUnitsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_TimeBasedRsusMember" name="TimeBasedRsusMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_AdventIXFundMember" name="AdventIXFundMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_LongTermDeferredContractCosts" name="LongTermDeferredContractCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="dh_BasicNetLossPerShareAttributableToCommonStockholdersAbstract" name="BasicNetLossPerShareAttributableToCommonStockholdersAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_DeferredTaxLiabilitiesDeferredRevenuesAndAdvances" name="DeferredTaxLiabilitiesDeferredRevenuesAndAdvances" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="dh_TwoThousandTwentyOneEquityIncentivePlanMember" name="TwoThousandTwentyOneEquityIncentivePlanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_IssuedAndOutstandingUnits" name="IssuedAndOutstandingUnits" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="dh_IssuanceOfCommonStockShares" name="IssuanceOfCommonStockShares" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="dh_ConsiderationPaidToFormerMembersIncludedInAccruedExpenses" name="ConsiderationPaidToFormerMembersIncludedInAccruedExpenses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="dh_SummaryOfEffectOfRestatementItemTableTextBlock" name="SummaryOfEffectOfRestatementItemTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="dh_WeightedAverageDiscountRateAbstract" name="WeightedAverageDiscountRateAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_TermOfSubscriptionContracts" name="TermOfSubscriptionContracts" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="dh_EffectiveIncomeTaxRateReconciliationAtStockCompensationShortfall" name="EffectiveIncomeTaxRateReconciliationAtStockCompensationShortfall" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="dh_NetIncomeLoss1" name="NetIncomeLoss1" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="dh_EffectiveIncomeTaxRateReconciliationAtTraRemeasurement" name="EffectiveIncomeTaxRateReconciliationAtTraRemeasurement" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="dh_SummaryOfAllocationOfPurchasePriceToTheFairValueOfAssetsAcquiredTableTextBlock" name="SummaryOfAllocationOfPurchasePriceToTheFairValueOfAssetsAcquiredTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="dh_DeferredInitialPublicOfferingCostsPolicyTextBlock" name="DeferredInitialPublicOfferingCostsPolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="dh_NetLossAttributableToParentPriorToTheReorganizationTransactions" name="NetLossAttributableToParentPriorToTheReorganizationTransactions" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="dh_EffectiveIncomeTaxRateReconciliationPartnershipIncomeNotSubjectToTaxationTaxRate" name="EffectiveIncomeTaxRateReconciliationPartnershipIncomeNotSubjectToTaxationTaxRate" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="dh_InitialCashInvestmentInPriorYear" name="InitialCashInvestmentInPriorYear" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="dh_RecoveryOfProvisionForDoubtfulAccountsReceivable" name="RecoveryOfProvisionForDoubtfulAccountsReceivable" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="dh_StockIssuanceCostNet" name="StockIssuanceCostNet" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="dh_ComputersAndSoftwareMember" name="ComputersAndSoftwareMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_DeferredContractCostsMember" name="DeferredContractCostsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_MembersEquityMember" name="MembersEquityMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_DefinitiveHoldcoAcquisitionMember" name="DefinitiveHoldcoAcquisitionMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_TaxReceivableAgreementLiability" name="TaxReceivableAgreementLiability" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="dh_RevenueRemainingPerformanceObligationCurrent" name="RevenueRemainingPerformanceObligationCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="dh_InitialValueOfContingentConsideration" name="InitialValueOfContingentConsideration" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="dh_AdjustmentsToAmortizationExpense" name="AdjustmentsToAmortizationExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="dh_ChangesInFairValueOfContingentConsideration" name="ChangesInFairValueOfContingentConsideration" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="dh_SecondaryOfferingMember" name="SecondaryOfferingMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_TaxReceivableAgreementRealizedTaxBenefitsPayableToRelatedParties" name="TaxReceivableAgreementRealizedTaxBenefitsPayableToRelatedParties" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="dh_ForeignSubsidiariesMember" name="ForeignSubsidiariesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseRightOfUseAssets" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseRightOfUseAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="dh_EffectiveIncomeTaxRateReconciliationAtOutsideBasisAdjustment" name="EffectiveIncomeTaxRateReconciliationAtOutsideBasisAdjustment" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="dh_ProceedsFromDelayedDrawTermLoan" name="ProceedsFromDelayedDrawTermLoan" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="dh_ConstructionAndSoftwareDevelopmentInProcessMember" name="ConstructionAndSoftwareDevelopmentInProcessMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_TaxReceivableAgreementRemeasurement" name="TaxReceivableAgreementRemeasurement" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="dh_AwAcquisitionMember" name="AwAcquisitionMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_PurchaseOfLimitedLiabilityCompanyLlcUnit" name="PurchaseOfLimitedLiabilityCompanyLlcUnit" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="dh_DeferredTaxAssetsOutsidePartnershipBasisDifference" name="DeferredTaxAssetsOutsidePartnershipBasisDifference" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="dh_SoftwareDevelopmentCostsPolicyTextBlock" name="SoftwareDevelopmentCostsPolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="dh_CashPaidDuringYearFor" name="CashPaidDuringYearFor" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="dh_EffectOfLlcUnitExchangeShares" name="EffectOfLlcUnitExchangeShares" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="dh_AdditionalLiabilityOnNetOperatingLossTaxAdjustment" name="AdditionalLiabilityOnNetOperatingLossTaxAdjustment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="dh_ProfessionalServicesMember" name="ProfessionalServicesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_TwoThousandNineteenTermLoanMember" name="TwoThousandNineteenTermLoanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_ForfeitedUnvestedIncentiveUnits" name="ForfeitedUnvestedIncentiveUnits" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="dh_AIDHHoldingsMember" name="AIDHHoldingsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_GoldmanSachsBankUsaMember" name="GoldmanSachsBankUsaMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_TwoThousandTwentyOneTermLoanMember" name="TwoThousandTwentyOneTermLoanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_ReportingUnitMarketCapitalizationByUsingSharePrice" name="ReportingUnitMarketCapitalizationByUsingSharePrice" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="dh_Additionalleasetermperiod" name="Additionalleasetermperiod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="dh_SupplementalDisclosuresOfInvestingActivitiesAbstract" name="SupplementalDisclosuresOfInvestingActivitiesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_TaxReceivableAgreementRemeasurementGain" name="TaxReceivableAgreementRemeasurementGain" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="dh_NetSalesCustomerAccountedPercentage" name="NetSalesCustomerAccountedPercentage" type="xbrli:pureItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="dh_RightOfUseAssetsObtainedInExchangeForNewLeaseLiabilitiesAbstract" name="RightOfUseAssetsObtainedInExchangeForNewLeaseLiabilitiesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="dh_TaxreceivableAgreementLiabilityIncreased" name="TaxreceivableAgreementLiabilityIncreased" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
</xsd:schema>
