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*: increase the performance of loading stats #17688

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Jun 28, 2024
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*: increase the performance of loading stats #17688

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*: change default value of tidb_analyze_skip_column_types
hawkingrei Jun 14, 2024
22f63ac
Update system-variables.md
hfxsd Jun 14, 2024
590562c
stats-load-concurrency
hawkingrei Jun 18, 2024
bee4c88
Update tidb-configuration-file.md
hfxsd Jun 18, 2024
8080ce0
Update wording and format
lilin90 Jun 19, 2024
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2 changes: 1 addition & 1 deletion system-variables.md
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Expand Up @@ -1002,7 +1002,7 @@ MPP 是 TiFlash 引擎提供的分布式计算框架，允许节点之间的数
- 作用域：SESSION | 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："json,blob,mediumblob,longblob"
- 默认值："json,blob,mediumblob,longblob,mediumtext,longtext"。在 v8.2.0 之前的版本，默认值为 "json,blob,mediumblob,longblob"。
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- 可选值："json,blob,mediumblob,longblob,text,mediumtext,longtext"
- 这个变量表示在执行 `ANALYZE` 命令收集统计信息时，跳过哪些类型的列的统计信息收集。该变量仅适用于 [`tidb_analyze_version = 2`](#tidb_analyze_version-从-v510-版本开始引入) 的情况。即使使用 `ANALYZE TABLE t COLUMNS c1, ..., cn` 语法指定列，如果指定的列的类型在 `tidb_analyze_skip_column_types` 中，也不会收集该列的统计信息。

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4 changes: 2 additions & 2 deletions tidb-configuration-file.md
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Expand Up @@ -572,8 +572,8 @@ TiDB 配置文件比命令行参数支持更多的选项。你可以在 [config/
### `stats-load-concurrency` <span class="version-mark">从 v5.4.0 版本开始引入</span>

+ TiDB 统计信息同步加载功能可以并发处理的最大列数
+ 默认值：5
+ 目前的合法值范围：`[1, 128]`
+ 默认值：0。在 v8.2.0 之前，默认值为 5。
+ 目前的合法值范围：`[0, 128]`。0 为自动模式，根据服务器情况，自动调节并发度。在 v8.2.0 之前，最小值为 1。
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### `stats-load-queue-size` <span class="version-mark">从 v5.4.0 版本开始引入</span>

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