cloud: update the default value of tidb_analyze_version (#15067) (#15081

)

statistics.md

@@ -11,8 +11,9 @@ TiDB uses statistics to decide [which index to choose](/choose-index.md).
 
 The `tidb_analyze_version` variable controls the statistics collected by TiDB. Currently, two versions of statistics are supported: `tidb_analyze_version = 1` and `tidb_analyze_version = 2`.
 
-- For TiDB Self-Hosted, the default value of this variable is `1` before v5.1.0. In v5.3.0 and later versions, the default value of this variable is `2`. If your cluster is upgraded from a version earlier than v5.3.0 to v5.3.0 or later, the default value of `tidb_analyze_version` does not change.
-- For TiDB Cloud, the default value of this variable is `1`.
+- For TiDB Self-Hosted, the default value of this variable changes from `1` to `2` starting from v5.3.0.
+- For TiDB Cloud, the default value of this variable changes from `1` to `2` starting from v6.5.0.
+- If your cluster is upgraded from an earlier version, the default value of `tidb_analyze_version` does not change after the upgrade.
 
 Compared to Version 1, Version 2 statistics avoids the potential inaccuracy caused by hash collision when the data volume is huge. It also maintains the estimate precision in most scenarios.
 

system-variables.md

@@ -1080,21 +1080,13 @@ MPP is a distributed computing framework provided by the TiFlash engine, which a
 - Persists to cluster: Yes
 - Applies to hint [SET_VAR](/optimizer-hints.md#set_varvar_namevar_value): No
 - Type: Integer
-- Default value: `2` for TiDB Self-Hosted and `1` for TiDB Cloud
+- Default value: `2`
 - Range: `[1, 2]`
 - Controls how TiDB collects statistics.
-
-<CustomContent platform="tidb">
-
-- In v5.3.0 and later versions, the default value of this variable is `2`. If your cluster is upgraded from a version earlier than v5.3.0 to v5.3.0 or later, the default value of `tidb_analyze_version` does not change. For detailed introduction, see [Introduction to Statistics](/statistics.md).
-
-</CustomContent>
-
-<CustomContent platform="tidb-cloud">
-
-- For detailed introduction of this variable, see [Introduction to Statistics](/statistics.md).
-
-</CustomContent>
+    - For TiDB Self-Hosted, the default value of this variable changes from `1` to `2` starting from v5.3.0.
+    - For TiDB Cloud, the default value of this variable changes from `1` to `2` starting from v6.5.0.
+    - If your cluster is upgraded from an earlier version, the default value of `tidb_analyze_version` does not change after the upgrade.
+- For detailed introduction about this variable, see [Introduction to Statistics](/statistics.md).
 
 ### tidb_analyze_skip_column_types <span class="version-mark">New in v7.2.0</span>