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Update the default value of tidb_stmt_summary_max_stmt_count (#6021) #6023

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Jul 23, 2021
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Update the default value of tidb_stmt_summary_max_stmt_count (#6021) #6023

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1f1486c
This is an automated cherry-pick of #6021
TomShawn Jul 23, 2021
6534564
Update statement-summary-tables.md
TomShawn Jul 23, 2021
8775da9
Apply suggestions from code review
TomShawn Jul 23, 2021
f7cd8ce
Update system-variables.md
TomShawn Jul 23, 2021
8e5d06f
Update system-variables.md
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 @@ -130,7 +130,7 @@ mysql> 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 @@ -102,7 +102,7 @@ The following system variables are used to control the statement summary:
- `tidb_enable_stmt_summary`: Determines whether to enable the statement summary feature. `1` represents `enable`, and `0` means `disable`. The feature is enabled by default. The statistics in the system table are cleared if this feature is disabled. The statistics are re-calculated next time this feature is enabled. Tests have shown that enabling this feature has little impact on performance.
- `tidb_stmt_summary_refresh_interval`: The interval at which the `statements_summary` table is refreshed. The time unit is second (s). The default value is `1800`.
- `tidb_stmt_summary_history_size`: The size of each SQL statement category stored in the `statements_summary_history` table. The default value is `24`.
- `tidb_stmt_summary_max_stmt_count`: Limits the number of SQL statements that can be stored in statement summary tables. The default value is `200`. If the limit is exceeded, those SQL statements that recently remain unused are cleared.
- `tidb_stmt_summary_max_stmt_count`: Limits the number of SQL statements that can be stored in statement summary tables. The default value is `3000`. If the limit is exceeded, those SQL statements that recently remain unused are cleared.
- `tidb_stmt_summary_max_sql_length`: Specifies the longest display length of `DIGEST_TEXT` and `QUERY_SAMPLE_TEXT`. The default value is `4096`.
- `tidb_stmt_summary_internal_query`: Determines whether to count the TiDB SQL statements. `1` means to count, and `0` means not to count. The default value is `0`.

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2 changes: 1 addition & 1 deletion system-variables.md
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Expand Up @@ -1269,7 +1269,7 @@ SET tidb_slow_log_threshold = 200;
### tidb_stmt_summary_max_stmt_count <span class="version-mark">New in v4.0</span>

- Scope: SESSION | GLOBAL
- Default value: `200`
- Default value: `3000`
- Range: `[1, 32767]`
- This variable is used to set the maximum number of statements that the statement summary stores in memory.

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