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system-variables: add variable description #3672

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Aug 17, 2020
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system-variables: add variable description #3672

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Update system-variables.md
Joyinqin Aug 17, 2020
1f700cb
Update system-variables.md
Joyinqin Aug 17, 2020
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6 changes: 6 additions & 0 deletions system-variables.md
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Expand Up @@ -71,6 +71,12 @@ SET GLOBAL tidb_distsql_scan_concurrency = 10;
>
> Unlike in MySQL, the `max_execution_time` system variable currently works on all kinds of statements in TiDB, not only restricted to the `SELECT` statement. The precision of the timeout value is roughly 100ms. This means the statement might not be terminated in accurate milliseconds as you specify.

### `interactive_timeout`

- Scope: SESSION | GLOBAL
- Default value: 28800
- This variable represents the idle timeout of the interactive user session, which is measured in seconds. Interactive user session refers to the session established by calling [`mysql_real_connect()`](https://dev.mysql.com/doc/c-api/5.7/en/mysql-real-connect.html) API using the `CLIENT_INTERACTIVE` option (for example, MySQL shell client). This variable is fully compatible with MySQL.

### sql_mode

- Scope: SESSION | GLOBAL
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