[[["易于理解","easyToUnderstand","thumb-up"],["解决了我的问题","solvedMyProblem","thumb-up"],["其他","otherUp","thumb-up"]],[["很难理解","hardToUnderstand","thumb-down"],["信息或示例代码不正确","incorrectInformationOrSampleCode","thumb-down"],["没有我需要的信息/示例","missingTheInformationSamplesINeed","thumb-down"],["翻译问题","translationIssue","thumb-down"],["其他","otherDown","thumb-down"]],["最后更新时间 (UTC)：2025-09-03。"],[[["\u003cp\u003eThis page describes the system behavior for Legacy Cloud Datastore databases, not Firestore in Datastore mode.\u003c/p\u003e\n"],["\u003cp\u003eMulti-region locations store multiple database replicas across different regions for data redundancy.\u003c/p\u003e\n"],["\u003cp\u003eData is also replicated across zones within a region to ensure continued service in case of a zone failure.\u003c/p\u003e\n"],["\u003cp\u003eEach multi-region includes at least two read-write regions that process both read and write operations and a witness region that participates in replication.\u003c/p\u003e\n"],["\u003cp\u003eThere are currently two multi-region locations available, \u003ccode\u003eeur3\u003c/code\u003e for Europe and \u003ccode\u003enam5\u003c/code\u003e for the United States, each with their own assigned read-write regions and a witness region.\u003c/p\u003e\n"]]],[],null,["# Multi-region locations (Legacy Cloud Datastore)\n\n| **Warning:** This page describes system behavior for Legacy Cloud Datastore databases that have not yet upgraded to Firestore in Datastore mode. For Firestore in Datastore mode databases, see [Firestore in Datastore mode Locations](/datastore/docs/locations#location-mr).\n\nA multi-region location consists of a defined set of\n[regions](https://cloud.google.com/docs/geography-and-regions#regions_and_zones) where multiple replicas of the database\nare stored. Each replica is either a read-write replica which contains\nall of the data in the database or a witness replica which does not\nmaintain a full set of data but participates in replication.\n\nBy replicating the data between multiple regions, data\ncan continue to be served even with the loss of an entire\nregion. Within a region, data is replicated across\n[zones](https://cloud.google.com/docs/geography-and-regions#regions_and_zones) so that data can continue to be served\nwithin that region even with the loss of a zone.\n\nEach multi-region location includes at least two read-write regions that serve\nread and write traffic. A third region is a witness region in `nam5` and\na read-write region in `eur3`.\n\nThe following multi-region locations are available:"]]
