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SHOW SHARDING ALGORITHMS

Description

The SHOW SHARDING ALGORITHMS syntax is used to query the sharding algorithms in the specified database.

Syntax

ShowShardingAlgorithms::=
  'SHOW' 'SHARDING' 'ALGORITHMS' ('FROM' databaseName)?

databaseName ::=
  identifier

Supplement

  • When databaseName is not specified, the default is the currently used DATABASE. If DATABASE is not used, No database selected will be prompted.

Return value description

Column Description
name Sharding algorithm name
type Sharding algorithm type
props Sharding algorithm properties

Example

  • Query the sharding table algorithms of the specified logical database
SHOW SHARDING ALGORITHMS FROM sharding_db;

mysql> SHOW SHARDING ALGORITHMS FROM sharding_db;
+-------------------------+--------+-----------------------------------------------------+
| name                    | type   | props                                               |
+-------------------------+--------+-----------------------------------------------------+
| t_order_inline          | INLINE | algorithm-expression=t_order_${order_id % 2}        |
| t_order_item_inline     | INLINE | algorithm-expression=t_order_item_${order_id % 2}   |
+-------------------------+--------+-----------------------------------------------------+
2 rows in set (0.01 sec)
  • Query the sharding table algorithms of the current logical database
SHOW SHARDING ALGORITHMS;

mysql> SHOW SHARDING ALGORITHMS;
+-------------------------+--------+-----------------------------------------------------+
| name                    | type   | props                                               |
+-------------------------+--------+-----------------------------------------------------+
| t_order_inline          | INLINE | algorithm-expression=t_order_${order_id % 2}        |
| t_order_item_inline     | INLINE | algorithm-expression=t_order_item_${order_id % 2}   |
+-------------------------+--------+-----------------------------------------------------+
2 rows in set (0.01 sec)

Reserved word

SHOW, SHARDING, ALGORITHMS, FROM