[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-07 UTC."],[[["\u003cp\u003eThis webpage provides documentation for the \u003ccode\u003eDatabase.Types.ConcurrencyMode\u003c/code\u003e enum within the Firestore Admin v1 API.\u003c/p\u003e\n"],["\u003cp\u003eThe latest version of the API documented is 3.12.0, with links available for previous versions back to 2.2.0.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eConcurrencyMode\u003c/code\u003e enum defines different types of concurrency control for transactions, including \u003ccode\u003eOptimistic\u003c/code\u003e, \u003ccode\u003eOptimisticWithEntityGroups\u003c/code\u003e, and \u003ccode\u003ePessimistic\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eOptimisticWithEntityGroups\u003c/code\u003e mode is specific to Cloud Datastore, and should only be used with Firestore in Datastore mode.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003ePessimistic\u003c/code\u003e mode is the default concurrency control method for Cloud Firestore databases.\u003c/p\u003e\n"]]],[],null,["# Firestore Admin v1 API - Enum Database.Types.ConcurrencyMode (3.15.0)\n\nVersion latestkeyboard_arrow_down\n\n- [3.15.0 (latest)](/dotnet/docs/reference/Google.Cloud.Firestore.Admin.V1/latest/Google.Cloud.Firestore.Admin.V1.Database.Types.ConcurrencyMode)\n- [3.14.0](/dotnet/docs/reference/Google.Cloud.Firestore.Admin.V1/3.14.0/Google.Cloud.Firestore.Admin.V1.Database.Types.ConcurrencyMode)\n- [3.13.0](/dotnet/docs/reference/Google.Cloud.Firestore.Admin.V1/3.13.0/Google.Cloud.Firestore.Admin.V1.Database.Types.ConcurrencyMode)\n- [3.12.0](/dotnet/docs/reference/Google.Cloud.Firestore.Admin.V1/3.12.0/Google.Cloud.Firestore.Admin.V1.Database.Types.ConcurrencyMode)\n- [3.11.0](/dotnet/docs/reference/Google.Cloud.Firestore.Admin.V1/3.11.0/Google.Cloud.Firestore.Admin.V1.Database.Types.ConcurrencyMode)\n- [3.10.0](/dotnet/docs/reference/Google.Cloud.Firestore.Admin.V1/3.10.0/Google.Cloud.Firestore.Admin.V1.Database.Types.ConcurrencyMode)\n- [3.9.0](/dotnet/docs/reference/Google.Cloud.Firestore.Admin.V1/3.9.0/Google.Cloud.Firestore.Admin.V1.Database.Types.ConcurrencyMode)\n- [3.8.0](/dotnet/docs/reference/Google.Cloud.Firestore.Admin.V1/3.8.0/Google.Cloud.Firestore.Admin.V1.Database.Types.ConcurrencyMode)\n- [3.7.0](/dotnet/docs/reference/Google.Cloud.Firestore.Admin.V1/3.7.0/Google.Cloud.Firestore.Admin.V1.Database.Types.ConcurrencyMode)\n- [3.6.0](/dotnet/docs/reference/Google.Cloud.Firestore.Admin.V1/3.6.0/Google.Cloud.Firestore.Admin.V1.Database.Types.ConcurrencyMode)\n- [3.5.0](/dotnet/docs/reference/Google.Cloud.Firestore.Admin.V1/3.5.0/Google.Cloud.Firestore.Admin.V1.Database.Types.ConcurrencyMode)\n- [3.4.0](/dotnet/docs/reference/Google.Cloud.Firestore.Admin.V1/3.4.0/Google.Cloud.Firestore.Admin.V1.Database.Types.ConcurrencyMode)\n- [3.3.0](/dotnet/docs/reference/Google.Cloud.Firestore.Admin.V1/3.3.0/Google.Cloud.Firestore.Admin.V1.Database.Types.ConcurrencyMode)\n- [3.2.0](/dotnet/docs/reference/Google.Cloud.Firestore.Admin.V1/3.2.0/Google.Cloud.Firestore.Admin.V1.Database.Types.ConcurrencyMode)\n- [3.1.0](/dotnet/docs/reference/Google.Cloud.Firestore.Admin.V1/3.1.0/Google.Cloud.Firestore.Admin.V1.Database.Types.ConcurrencyMode)\n- [3.0.0](/dotnet/docs/reference/Google.Cloud.Firestore.Admin.V1/3.0.0/Google.Cloud.Firestore.Admin.V1.Database.Types.ConcurrencyMode)\n- [2.4.0](/dotnet/docs/reference/Google.Cloud.Firestore.Admin.V1/2.4.0/Google.Cloud.Firestore.Admin.V1.Database.Types.ConcurrencyMode)\n- [2.3.0](/dotnet/docs/reference/Google.Cloud.Firestore.Admin.V1/2.3.0/Google.Cloud.Firestore.Admin.V1.Database.Types.ConcurrencyMode)\n- [2.2.0](/dotnet/docs/reference/Google.Cloud.Firestore.Admin.V1/2.2.0/Google.Cloud.Firestore.Admin.V1.Database.Types.ConcurrencyMode) \n\n public enum Database.Types.ConcurrencyMode\n\nReference documentation and code samples for the Firestore Admin v1 API enum Database.Types.ConcurrencyMode.\n\nThe type of concurrency control mode for transactions.\n\nNamespace\n---------\n\n[Google.Cloud.Firestore.Admin.V1](/dotnet/docs/reference/Google.Cloud.Firestore.Admin.V1/latest/Google.Cloud.Firestore.Admin.V1)\n\nAssembly\n--------\n\nGoogle.Cloud.Firestore.Admin.V1.dll"]]