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update default value of tidb_analyze_version in v5.1 and v5.2 (#8411) #8551

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Apr 26, 2022
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update default value of tidb_analyze_version in v5.1 and v5.2 (#8411) #8551

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update default value of tidb_analyze_version in v5.1 and v5.2
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7 changes: 6 additions & 1 deletion statistics.md
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Expand Up @@ -4,7 +4,12 @@ title: 统计信息简介

# 统计信息简介

TiDB 使用统计信息来决定[索引的选择](/choose-index.md)。变量 `tidb_analyze_version` 用于控制所收集到的统计信息。目前 TiDB 中支持两种统计信息：`tidb_analyze_version = 1` 以及 `tidb_analyze_version = 2`。在 v5.1.0 以前的版本中，该变量的默认值为 `1`。在 v5.1、v5.2、v5.3 中，该变量的默认值为 `2`，作为实验特性启用。
TiDB 使用统计信息来决定[索引的选择](/choose-index.md)。变量 `tidb_analyze_version` 用于控制所收集到的统计信息。目前 TiDB 中支持两种统计信息：`tidb_analyze_version = 1` 以及 `tidb_analyze_version = 2`。`tidb_analyze_version` 在 TiDB v5.1.x 各版本的默认值说明如下：
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| 版本 | 默认值 |
| :- | :- |
| v5.1.0 - v5.1.3 | `2`，作为实验特性使用 |
| v5.1.4 及之后的 v5.1.x 版本 | `1` |
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> **注意：**
>
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7 changes: 6 additions & 1 deletion system-variables.md
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Expand Up @@ -291,7 +291,12 @@ MPP 是 TiFlash 引擎提供的分布式计算框架，允许节点之间的数
- 默认值：`2`
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- 范围：`[1, 2]`
- 这个变量用于控制 TiDB 收集统计信息的行为。
- 在 v5.1.0 以前的版本中，该变量的默认值为 `1`。在 v5.1.0 中，该变量的默认值为 `2`，作为实验特性使用，具体可参照[统计信息简介](/statistics.md)文档。
- `tidb_analyze_version` 在 TiDB v5.1.x 各版本的默认值说明如下，具体可参照[统计信息简介](/statistics.md)文档。
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| 版本 | 默认值 |
| :- | :- |
| v5.1.0 - v5.1.3 | `2`，作为实验特性使用 |
| v5.1.4 及之后的 v5.1.x 版本 | `1` |
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### `tidb_auto_analyze_end_time`

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