SHOW DEFAULT SHARDING STRATEGY
Description
The SHOW DEFAULT SHARDING STRATEGY syntax is used to query default sharding strategy in specified database.
Syntax
ShowDefaultShardingStrategy::=
'SHOW' 'DEFAULT' 'SHARDING' 'STRATEGY' ('FROM' databaseName)?
databaseName ::=
identifierSupplement
- When
databaseNameis not specified, the default is the currently usedDATABASE. IfDATABASEis not used,No database selectedwill be prompted.
Return value description
| Column | Description |
|---|---|
| name | Sharding strategy scope |
| type | Sharding strategy type |
| sharding_column | Sharding column |
| sharding_algorithm_name | Sharding algorithm name |
| sharding_algorithm_type | Sharding algorithm type |
| sharding_algorithm_props | Sharding algorithm properties |
Example
- Query default sharding strategy in specified database.
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)- Query default sharding strategy in current database.
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)Reserved word
SHOW, DEFAULT, SHARDING, STRATEGY, FROM