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SHOW SHADOW RULE

Description

The SHOW SHADOW RULE syntax is used to query shadow rules for specified database.

Syntax

ShowShadowRule::=
  'SHOW' 'SHADOW' ('RULES' | 'RULE' shadowRuleName) ('FROM' databaseName)?

shadowRuleName ::=
  identifier
  
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
rule_name Shadow rule name
source_name Data source name
shadow_name Shadow data source name
shadow_table Shadow table

Example

  • Query specified shadow rule in specified database.
SHOW SHADOW RULE shadow_rule FROM shadow_db;

mysql> SHOW SHADOW RULE shadow_rule FROM shadow_db;
+-------------+-------------+-------------+----------------------+
| rule_name   | source_name | shadow_name | shadow_table         |
+-------------+-------------+-------------+----------------------+
| shadow_rule | ds_0        | ds_1        | t_order_item,t_order |
+-------------+-------------+-------------+----------------------+
1 row in set (0.00 sec)
  • Query specified shadow rule in current database.
SHOW SHADOW RULE shadow_rule;

mysql> SHOW SHADOW RULE shadow_rule;
+-------------+-------------+-------------+----------------------+
| rule_name   | source_name | shadow_name | shadow_table         |
+-------------+-------------+-------------+----------------------+
| shadow_rule | ds_0        | ds_1        | t_order_item,t_order |
+-------------+-------------+-------------+----------------------+
1 row in set (0.01 sec)
  • Query shadow rules for specified database.
SHOW SHADOW RULES FROM shadow_db;

mysql> SHOW SHADOW RULES FROM shadow_db;
+-------------+-------------+-------------+----------------------+
| rule_name   | source_name | shadow_name | shadow_table         |
+-------------+-------------+-------------+----------------------+
| shadow_rule | ds_0        | ds_1        | t_order_item,t_order |
+-------------+-------------+-------------+----------------------+
1 row in set (0.00 sec)
  • Query shadow rules for current database.
SHOW SHADOW RULES;

mysql> SHOW SHADOW RULES;
+-------------+-------------+-------------+----------------------+
| rule_name   | source_name | shadow_name | shadow_table         |
+-------------+-------------+-------------+----------------------+
| shadow_rule | ds_0        | ds_1        | t_order_item,t_order |
+-------------+-------------+-------------+----------------------+
1 row in set (0.00 sec)

Reserved word

SHOW, SHADOW, RULE, RULES, FROM