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system-variables: update the default value of datadir (#13336) #13339

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Apr 25, 2023
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system-variables: update the default value of datadir (#13336) #13339

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20 changes: 18 additions & 2 deletions system-variables.md
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Expand Up @@ -180,9 +180,25 @@ mysql> SELECT * FROM t1;

### datadir

<CustomContent platform="tidb">

- Scope: NONE
- Default value: it depends on the component and the deployment method.
- `/tmp/tidb`: when you set `"unistore"` for [`--store`](/command-line-flags-for-tidb-configuration.md#--store) or if you don't set `--store`.
- `${pd-ip}:${pd-port}`: when you use TiKV, which is the default storage engine for TiUP and TiDB Operator for Kubernetes deployments.
- This variable indicates the location where data is stored. This location can be a local path `/tmp/tidb`, or point to a PD server if the data is stored on TiKV. A value in the format of `${pd-ip}:${pd-port}` indicates the PD server that TiDB connects to on startup.

</CustomContent>

<CustomContent platform="tidb-cloud">

- Scope: NONE
- Default value: ${ip_address:port}
- A value in the format of `ip_address:port` indicates the PD server that TiDB connects to on startup.
- Default value: it depends on the component and the deployment method.
- `/tmp/tidb`: when you set `"unistore"` for [`--store`](https://docs.pingcap.com/tidb/stable/command-line-flags-for-tidb-configuration#--store) or if you don't set `--store`.
- `${pd-ip}:${pd-port}`: when you use TiKV, which is the default storage engine for TiUP and TiDB Operator for Kubernetes deployments.
- This variable indicates the location where data is stored. This location can be a local path `/tmp/tidb`, or point to a PD server if the data is stored on TiKV. A value in the format of `${pd-ip}:${pd-port}` indicates the PD server that TiDB connects to on startup.

</CustomContent>

### ddl_slow_threshold

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