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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 ::=
  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 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