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add doc for experimental variable tidb_store_batch_size #11562

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Dec 9, 2022
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add doc for experimental variable tidb_store_batch_size #11562

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add tidb_store_batch_size variable
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Update system-variables.md
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more notice
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not an experimental variable'
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14 changes: 14 additions & 0 deletions system-variables.md
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Expand Up @@ -3744,6 +3744,20 @@ For details, see [Identify Slow Queries](/identify-slow-queries.md).
- Unit: Seconds
- This variable is used to set the refresh time of [statement summary tables](/statement-summary-tables.md).

### `tidb_store_batch_size`

> **Warning:**
>
> Currently,`tidb_store_batch_size` is not stable yet. This variable may be removed in the future, it is not recommended that you use it in production environments.
> Suggest to use the default value.
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- Scope: SESSION | GLOBAL
- Persists to cluster: Yes
- Type: Integer
- Default value: `0`
- Range: `[0, 25000]`
- This variable is used to control the batch size of table reader Coprocessor Tasks of the `IndexLookUp` executor. `0` means disable batch. When the number of tasks is relatively large and slow queries occur, you can increase this variable to optimize the query.
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### tidb_store_limit <span class="version-mark">New in v3.0.4 and v4.0</span>

- Scope: GLOBAL
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