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planner: add tidb_enable_binding_usage #21946

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9 changes: 9 additions & 0 deletions system-variables.md
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Expand Up @@ -1937,6 +1937,15 @@ mysql> SELECT job_info FROM mysql.analyze_jobs ORDER BY end_time DESC LIMIT 1;
- Default value: `OFF`
- This variable controls whether to enable the deprecated batch-dml feature. When it is enabled, certain statements might be split into multiple transactions, which is non-atomic and should be used with care. When using batch-dml, you must ensure that there are no concurrent operations on the data you are operating on. To make it work, you must also specify a positive value for `tidb_batch_dml_size` and enable at least one of `tidb_batch_insert` and `tidb_batch_delete`.

### tidb_enable_binding_usage <span class="version-mark">New in v8.5.4 and v9.0.0</span>

- Scope: GLOBAL
- Persists to cluster: Yes
- Applies to hint [SET_VAR](/optimizer-hints.md#set_varvar_namevar_value): No
- Type: Boolean
- Default value: `ON`
- This variable controls whether to collect the usage statistics of SQL plan bindings. When it is set to `ON`, TiDB writes the usage statistics of SQL plan bindings to the `mysql.bind_info` table every six hours.

### tidb_enable_cascades_planner

> **Warning:**
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