tidb: document analyze v1 removal#22655
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| > **Warning:** | ||
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| > If your TiDB cluster is upgraded from an earlier version and still has existing Version 1 statistics, TiDB can continue to read these Version 1 statistics for upgrade compatibility. However, TiDB can no longer collect new statistics using Version 1. It is recommended that you use Statistics Version 2 (`tidb_analyze_version = 2`) and [migrate existing objects that use Statistics Version 1 to Version 2](#switch-between-statistics-versions). |
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| > If your TiDB cluster is upgraded from an earlier version and still has existing Version 1 statistics, TiDB can continue to read these Version 1 statistics for upgrade compatibility. However, TiDB can no longer collect new statistics using Version 1. It is recommended that you use Statistics Version 2 (`tidb_analyze_version = 2`) and [migrate existing objects that use Statistics Version 1 to Version 2](#switch-between-statistics-versions). | |
| > If your TiDB cluster is upgraded from an earlier version and still has Version 1 statistics collected before the upgrade, TiDB can continue to read these Version 1 statistics for upgrade compatibility. However, TiDB can no longer collect new statistics using Version 1. It is recommended that you use Statistics Version 2 (`tidb_analyze_version = 2`) and [migrate existing objects that use Statistics Version 1 to Version 2](#switch-between-statistics-versions). |
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What is changed, added or deleted? (Required)
Document on
masterthat Statistics Version 1 (tidb_analyze_version = 1) is no longer supported for new statistics collection. Update the statistics, system variable, and analyze status docs to describe the legacy read-only compatibility path and the migration and upgrade behavior.Which TiDB version(s) do your changes apply to? (Required)
What is the related PR or file link(s)?
Do your changes match any of the following descriptions?