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add description about force-init-stats in introduction to statistics #13546

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May 15, 2023
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add description about force-init-stats in introduction to statistics #13546

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add description about force-init-stats in introduction to statistics
xuyifangreeneyes May 11, 2023
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Update statistics.md
hfxsd May 12, 2023
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Update statistics.md
hfxsd May 12, 2023
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Expand Up @@ -725,6 +725,8 @@ After enabling the synchronously loading statistics feature, you can further con
- To specify the maximum number of columns that the synchronously loading statistics feature can process concurrently, modify the value of the [`stats-load-concurrency`](/tidb-configuration-file.md#stats-load-concurrency-new-in-v540) option in the TiDB configuration file. The default value is `5`.
- To specify the maximum number of column requests that the synchronously loading statistics feature can cache, modify the value of the [`stats-load-queue-size`](/tidb-configuration-file.md#stats-load-queue-size-new-in-v540) option in the TiDB configuration file. The default value is `1000`.

During TiDB startup, SQL statements executed before the initial statistics are fully loaded might have suboptimal execution plans, thus causing performance issues. To avoid such issues, TiDB v7.1.0 introduces the configuration parameter [`force-init-stats`](/tidb-configuration-file.md#force-init-stats-new-in-v710). With this option, you can control whether TiDB provides services only after statistics initialization has been finished during startup. This parameter is disabled by default.

> **Warning:**
>
> Lightweight statistics initialization is an experimental feature. It is not recommended that you use it in the production environment. This feature might be changed or removed without prior notice. If you find a bug, you can report an [issue](https://github.com/pingcap/tidb/issues) on GitHub.
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