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Update the default value of tidb_stmt_summary_max_stmt_count (#6718) #6719

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Update the default value of tidb_stmt_summary_max_stmt_count (#6718) #6719

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7008459
This is an automated cherry-pick of #6718
TomShawn Jul 23, 2021
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TomShawn Jul 23, 2021
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2 changes: 1 addition & 1 deletion sql-statements/sql-statement-show-variables.md
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Expand Up @@ -135,7 +135,7 @@ SHOW GLOBAL VARIABLES LIKE 'tidb%';
| tidb_stmt_summary_history_size | 24 |
| tidb_stmt_summary_internal_query | 0 |
| tidb_stmt_summary_max_sql_length | 4096 |
| tidb_stmt_summary_max_stmt_count | 200 |
| tidb_stmt_summary_max_stmt_count | 3000 |
| tidb_stmt_summary_refresh_interval | 1800 |
| tidb_store_limit | 0 |
| tidb_txn_mode | |
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2 changes: 1 addition & 1 deletion statement-summary-tables.md
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Expand Up @@ -99,7 +99,7 @@ select * from employee where id in (...) and salary between ? and ?;
- `tidb_enable_stmt_summary`：是否打开 statement summary 功能。1 代表打开，0 代表关闭，默认打开。statement summary 关闭后，系统表里的数据会被清空，下次打开后重新统计。经测试，打开后对性能几乎没有影响。
- `tidb_stmt_summary_refresh_interval`：`statements_summary` 的清空周期，单位是秒 (s)，默认值是 `1800`。
- `tidb_stmt_summary_history_size`：`statements_summary_history` 保存每种 SQL 的历史的数量，默认值是 `24`。
- `tidb_stmt_summary_max_stmt_count`：statement summary tables 保存的 SQL 种类数量，默认 200 条。当 SQL 种类超过该值时，会移除最近没有使用的 SQL。
- `tidb_stmt_summary_max_stmt_count`：statement summary tables 保存的 SQL 种类数量。v4.0.14 前，默认 200 条。自 v4.0.14，默认 3000 条。当 SQL 种类超过该值时，会移除最近没有使用的 SQL。
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- `tidb_stmt_summary_max_sql_length`：字段 `DIGEST_TEXT` 和 `QUERY_SAMPLE_TEXT` 的最大显示长度，默认值是 4096。
- `tidb_stmt_summary_internal_query`：是否统计 TiDB 的内部 SQL。1 代表统计，0 代表不统计，默认不统计。

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6 changes: 6 additions & 0 deletions system-variables.md
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Expand Up @@ -1269,8 +1269,14 @@ set tidb_slow_log_threshold = 200;
### `tidb_stmt_summary_max_stmt_count` <span class="version-mark">从 v4.0 版本开始引入</span>

- 作用域：SESSION | GLOBAL
<<<<<<< HEAD
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- 默认值：`200`
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- 范围：`[1, 32767]`
=======

- 默认值：v4.0.14 前为 200。自 v4.0.14 起为 3000（受配置文件影响，这里给出的是默认配置文件取值）

>>>>>>> c9dd5a125 (Update the default value of tidb_stmt_summary_max_stmt_count (#6718))
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- 这个变量设置了 statement summary 在内存中保存的语句的最大数量。

### `tidb_stmt_summary_refresh_interval` <span class="version-mark">从 v4.0 版本开始引入</span>
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