SHOW CONFIG

SHOW CONFIG 语句用于展示 TiDB 各个组件当前正在应用的配置,请注意,配置与系统变量作用于不同维度,请不要混淆,如果希望获取系统变量信息,请使用 SHOW VARIABLES 语法。

语法图

ShowConfigStmt
SHOWCONFIGShowLikeOrWhere
ShowLikeOrWhere
LIKESimpleExprWHEREExpression

示例

显示所有配置:

SHOW CONFIG;
+------+----------------+-------------------------------------------------+---------------------------------------------------------------------+ | Type | Instance | Name | Value | +------+----------------+-------------------------------------------------+---------------------------------------------------------------------+ | tidb | 127.0.0.1:4000 | advertise-address | 127.0.0.1 | | tidb | 127.0.0.1:4000 | binlog.binlog-socket | | | tidb | 127.0.0.1:4000 | binlog.enable | false | ... 120 rows in set (0.01 sec)

显示 typetidb 的配置:

SHOW CONFIG WHERE type = 'tidb' AND name = 'advertise-address';
+------+----------------+-------------------+-----------+ | Type | Instance | Name | Value | +------+----------------+-------------------+-----------+ | tidb | 127.0.0.1:4000 | advertise-address | 127.0.0.1 | +------+----------------+-------------------+-----------+ 1 row in set (0.05 sec)

也可以用 LIKE 子句来显示 typetidb 的配置:

SHOW CONFIG LIKE 'tidb';
+------+----------------+-------------------------------------------------+---------------------------------------------------------------------+ | Type | Instance | Name | Value | +------+----------------+-------------------------------------------------+---------------------------------------------------------------------+ | tidb | 127.0.0.1:4000 | advertise-address | 127.0.0.1 | | tidb | 127.0.0.1:4000 | binlog.binlog-socket | | | tidb | 127.0.0.1:4000 | binlog.enable | false | ... 40 rows in set (0.01 sec)

MySQL 兼容性

该语句是 TiDB 对 MySQL 语法的扩展。

另请参阅

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