[[["容易理解","easyToUnderstand","thumb-up"],["確實解決了我的問題","solvedMyProblem","thumb-up"],["其他","otherUp","thumb-up"]],[["難以理解","hardToUnderstand","thumb-down"],["資訊或程式碼範例有誤","incorrectInformationOrSampleCode","thumb-down"],["缺少我需要的資訊/範例","missingTheInformationSamplesINeed","thumb-down"],["翻譯問題","translationIssue","thumb-down"],["其他","otherDown","thumb-down"]],["上次更新時間:2025-09-04 (世界標準時間)。"],[],[],null,["# Preserve database clusters before an upgrade\n\nDepending on specific Google Distributed Cloud (GDC) air-gapped releases, existing database clusters may not be migrated forward from previous GDC versions. In these cases, before applying the release, you must confirm that there is no critical data that must be preserved. For data that must be preserved, follow these steps to migrate them forward:\n\nBefore applying the release, you must confirm that there is no critical data that must be preserved. For data that must be preserved, follow these steps to migrate them forward:\n\n1. [List database clusters](/distributed-cloud/hosted/docs/latest/gdch/application/ao-user/db-list-cluster) and identify the ones that must be preserved.\n2. For each database cluster, [export the data](/distributed-cloud/hosted/docs/latest/gdch/application/ao-user/db-export-cluster) and store it in a GDC bucket.\n3. Optional: To avoid additional changes, completely [delete the database cluster](/distributed-cloud/hosted/docs/latest/gdch/application/ao-user/db-delete-cluster) before applying the new GDC version.\n4. After the upgrade is complete, recreate the database cluster and [import the dump file](/distributed-cloud/hosted/docs/latest/gdch/application/ao-user/db-import-from-file) into it."]]