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change expressions related to statement summary tables #6299

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Sep 3, 2021
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change expressions related to statement summary tables #6299

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10 changes: 5 additions & 5 deletions system-variables.md
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Expand Up @@ -1278,34 +1278,34 @@ SET tidb_slow_log_threshold = 200;
- Scope: SESSION | GLOBAL
- Default value: `24`
- Range: `[0, 255]`
- This variable is used to set the history capacity of the statement summary.
- This variable is used to set the history capacity of [statement summary tables](/statement-summary-tables.md).

### tidb_stmt_summary_internal_query <span class="version-mark">New in v4.0</span>

- Scope: SESSION | GLOBAL
- Default value: `OFF`
- This variable is used to control whether to include the SQL information of TiDB in the statement summary.
- This variable is used to control whether to include the SQL information of TiDB in [statement summary tables](/statement-summary-tables.md).

### tidb_stmt_summary_max_sql_length <span class="version-mark">New in v4.0</span>

- Scope: SESSION | GLOBAL
- Default value: `4096`
- Range: `[0, 2147483647]`
- This variable is used to control the length of the SQL string in the statement summary.
- This variable is used to control the length of the SQL string in [statement summary tables](/statement-summary-tables.md).

### tidb_stmt_summary_max_stmt_count <span class="version-mark">New in v4.0</span>

- Scope: SESSION | GLOBAL
- Default value: `3000`
- Range: `[1, 32767]`
- This variable is used to set the maximum number of statements that the statement summary stores in memory.
- This variable is used to set the maximum number of statements that [statement summary tables](/statement-summary-tables.md) store in memory.

### tidb_stmt_summary_refresh_interval <span class="version-mark">New in v4.0</span>

- Scope: SESSION | GLOBAL
- Default value: `1800`
- Range: `[1, 2147483647]`
- This variable is used to set the refresh time of the statement summary. The unit is second.
- This variable is used to set the refresh time of [statement summary tables](/statement-summary-tables.md). The unit is second.

### tidb_store_limit <span class="version-mark">New in v3.0.4 and v4.0</span>

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6 changes: 3 additions & 3 deletions tidb-configuration-file.md
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Expand Up @@ -610,16 +610,16 @@ Configuration related to the status of TiDB service.

## stmt-summary <span class="version-mark">New in v3.0.4</span>

Configurations related to the `statements_summary` table.
Configurations related to [statement summary tables](/statement-summary-tables.md).

### max-stmt-count

- The maximum number of SQL categories allowed to be saved in the `statements_summary` table.
- The maximum number of SQL categories allowed to be saved in [statement summary tables](/statement-summary-tables.md).
- Default value: `3000`

### max-sql-length

- The longest display length for the `DIGEST_TEXT` and `QUERY_SAMPLE_TEXT` columns in the `statements_summary` table.
- The longest display length for the `DIGEST_TEXT` and `QUERY_SAMPLE_TEXT` columns in [statement summary tables](/statement-summary-tables.md).
- Default value: `4096`

## pessimistic-txn
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