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system-variables: Add charset documentation (#5867) #5909

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Jul 1, 2021
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system-variables: Add charset documentation (#5867) #5909

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system-variables: Add charset documentation
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Expand Up @@ -83,6 +83,36 @@ mysql> SELECT * FROM t1;
- Default value: `ON`
- Controls whether statements should automatically commit when not in an explicit transaction. See [Transaction Overview](/transaction-overview.md#autocommit) for more information.

### character_set_client

- Scope: SESSION | GLOBAL
- Default value: `utf8mb4`
- The character set for data sent from the client. See [Character Set and Collation](/character-set-and-collation.md) for details on the use of character sets and collations in TiDB. It is recommended to use [`SET NAMES`](/sql-statements/sql-statement-set-names.md) to change the character set when needed.

### character_set_connection

- Scope: SESSION | GLOBAL
- Default value: `utf8mb4`
- The character set for string literals that do not have a specified character set.

### character_set_database

- Scope: SESSION | GLOBAL
- Default value: `utf8mb4`
- This variable indicates the character set of the default database in use. **It is NOT recommended to set this variable**. When a new default database is selected, the server changes the variable value.

### character_set_results

- Scope: SESSION | GLOBAL
- Default value: `utf8mb4`
- The character set that is used when data is sent to the client.

### character_set_server

- Scope: SESSION | GLOBAL
- Default value: `utf8mb4`
- The character set used for new schemas when no character set is specified in the `CREATE SCHEMA` statement.

### `cte_max_recursion_depth`

- Scope：SESSION | GLOBAL
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