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*: upgrade tidb_auto_analyze_partition_batch_size default value #19405

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*: upgrade tidb_auto_analyze_partition_batch_size default value #19405

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*: upgrade tidb_auto_analyze_partition_batch_size default value
hawkingrei Dec 26, 2024
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update
hawkingrei Dec 26, 2024
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4 changes: 2 additions & 2 deletions system-variables.md
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Expand Up @@ -1070,8 +1070,8 @@ mysql> SELECT job_info FROM mysql.analyze_jobs ORDER BY end_time DESC LIMIT 1;
- 作用域：GLOBAL
- 是否持久化到集群：是
- 是否受 Hint [SET_VAR](/optimizer-hints.md#set_varvar_namevar_value) 控制：否
- 默认值：`128`。对于 TiDB v7.6.0 之前的版本，默认值为 `1`。
- 范围：`[1, 1024]`
- 默认值：`8192`。对于 TiDB v7.6.0 之前的版本，默认值为 `1`。在 v8.2.0 之前的版本中，默认值为 `128`。
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- 默认值：`8192`。对于 TiDB v7.6.0 之前的版本，默认值为 `1`。在 v8.2.0 之前的版本中，默认值为 `128`。
- 默认值：`8192`。对于 TiDB v7.6.0 之前的版本，默认值为 `1`。从 v8.2.0 开始，默认值从 `128` 变更为 `8192`。

- 范围：`[1, 8192]`, 8.2 之前,最大值为 1024
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@Oreoxmt Oreoxmt Dec 26, 2024 •
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- 范围：`[1, 8192]`, 8.2 之前,最大值为 1024
- 范围：`[1, 8192]`，v8.2.0 之前版本范围为 `[1, 1024]`

- 用于设置 TiDB [自动 analyze](/statistics.md#自动更新) 分区表（即自动收集分区表上的统计信息）时，每次同时 analyze 分区的个数。
- 若该变量值小于分区表的分区数，则 TiDB 会分多批自动 analyze 该分区表的所有分区。若该变量值大于等于分区表的分区数，则 TiDB 会同时 analyze 该分区表的所有分区。
- 若分区表个数远大于该变量值，且自动 analyze 花费时间较长，可调大该参数的值以减少耗时。
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