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*: add tidb_auto_analyze_concurrency #18925

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*: add tidb_auto_analyze_concurrency #18925

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*: add tidb_auto_analyze_concurrency
hawkingrei Sep 18, 2024
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Oreoxmt Sep 23, 2024
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Update system-variables.md
hawkingrei Sep 24, 2024
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10 changes: 10 additions & 0 deletions system-variables.md
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Expand Up @@ -1199,6 +1199,16 @@ mysql> SELECT job_info FROM mysql.analyze_jobs ORDER BY end_time DESC LIMIT 1;
1 row in set (0.00 sec)
```

### tidb_auto_analyze_concurrency <span class="version-mark">New in v8.4.0</span>

- Scope: GLOBAL
- Persists to cluster: Yes
- Applies to hint [SET_VAR](/optimizer-hints.md#set_varvar_namevar_value): No
- Type: Integer
- Default value: `2`
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- Range: `[1, 2147483647]`
- This variable is used to set the concurrency of executing the automatic update of statistics.
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这个变量和 tidb_auto_build_stats_concurrency 的区别是什么呢，描述看起来是一样的

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@hawkingrei hawkingrei Sep 24, 2024 •
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这个是一个 analyze 任务内部的并发。上面那个是可以并发执行多少 analyze 任务。


### tidb_auto_analyze_end_time

- Scope: GLOBAL
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