SHOW DEFAULT SHARDING STRATEGY

描述

SHOW DEFAULT SHARDING STRATEGY 语法用于查询指定逻辑库的默认分片策略。

语法

语法 铁路图

ShowDefaultShardingStrategy::=
  'SHOW' 'DEFAULT' 'SHARDING' 'STRATEGY' ('FROM' databaseName)?
databaseName ::=
  identifier

补充说明

• 未指定 databaseName 时，默认是当前使用的 DATABASE。 如果也未使用 DATABASE 则会提示 No database selected。

返回值说明

示例

• 查询指定逻辑库的默认分片策略

SHOW DEFAULT SHARDING STRATEGY FROM sharding_db;

mysql> SHOW DEFAULT SHARDING STRATEGY FROM sharding_db;
+----------+----------+-----------------+-------------------------+-------------------------+-----------------------------------------------------+
| name     | type     | sharding_column | sharding_algorithm_name | sharding_algorithm_type | sharding_algorithm_props                            |
+----------+----------+-----------------+-------------------------+-------------------------+-----------------------------------------------------+
| TABLE    | STANDARD | order_id        | table_inline            | inline                  | {algorithm-expression=t_order_item_${order_id % 2}} |
| DATABASE | STANDARD | order_id        | table_inline            | inline                  | {algorithm-expression=t_order_item_${order_id % 2}} |
+----------+----------+-----------------+-------------------------+-------------------------+-----------------------------------------------------+
2 rows in set (0.00 sec)

• 查询当前逻辑库的默认分片策略

SHOW DEFAULT SHARDING STRATEGY;

mysql> SHOW DEFAULT SHARDING STRATEGY;
+----------+----------+-----------------+-------------------------+-------------------------+-----------------------------------------------------+
| name     | type     | sharding_column | sharding_algorithm_name | sharding_algorithm_type | sharding_algorithm_props                            |
+----------+----------+-----------------+-------------------------+-------------------------+-----------------------------------------------------+
| TABLE    | STANDARD | order_id        | table_inline            | inline                  | {algorithm-expression=t_order_item_${order_id % 2}} |
| DATABASE | STANDARD | order_id        | table_inline            | inline                  | {algorithm-expression=t_order_item_${order_id % 2}} |
+----------+----------+-----------------+-------------------------+-------------------------+-----------------------------------------------------+
2 rows in set (0.00 sec)

保留字

SHOW、DEFAULT、SHARDING、STRATEGY、FROM

相关链接

• 保留字