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system-variables: optimize the persist info #18986

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Sep 23, 2024
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system-variables: optimize the persist info #18986

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6 changes: 3 additions & 3 deletions system-variables.md
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Expand Up @@ -1403,7 +1403,7 @@ mysql> SELECT job_info FROM mysql.analyze_jobs ORDER BY end_time DESC LIMIT 1;
> This variable is read-only for [TiDB Cloud Serverless](https://docs.pingcap.com/tidbcloud/select-cluster-tier#tidb-cloud-serverless).

- Scope: SESSION
- Persists to cluster: No
- Persists to cluster: No, only applicable to the current TiDB instance that you are connecting to.
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- Applies to hint [SET_VAR](/optimizer-hints.md#set_varvar_namevar_value): No
- Type: Integer
- Default value: `0`
Expand Down Expand Up @@ -5235,7 +5235,7 @@ SHOW WARNINGS;
> This TiDB variable is not applicable to TiDB Cloud.

- Scope: GLOBAL
- Persists to cluster: No
- Persists to cluster: No, only applicable to the current TiDB instance that you are connecting to.
- Applies to hint [SET_VAR](/optimizer-hints.md#set_varvar_namevar_value): No
- Type: String
- Default value: ""
Expand All @@ -5245,7 +5245,7 @@ SHOW WARNINGS;
### tidb_session_alias <span class="version-mark">New in v7.4.0</span>

- Scope: SESSION
- Persists to cluster: No
- Persists to cluster: No, only applicable to the current TiDB instance that you are connecting to.
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- Applies to hint [SET_VAR](/optimizer-hints.md#set_varvar_namevar_value): Yes
- Default value: ""
- You can use this variable to customize the value of the `session_alias` column in the logs related to the current session, which helps identify the session in troubleshooting. This setting affects the logs of multiple nodes involved in the statement execution (including TiKV). The maximum length of this variable is limited to 64 characters, and any characters exceeding the length will be truncated automatically. Spaces at the end of the value will also be removed automatically.
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