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COUNT SHADOW RULE

Description

The COUNT SHADOW RULE syntax is used to query the number of shadow rules for specified database.

Syntax

CountShadowRule::=
  'COUNT' 'SHADOW' 'RULE' ('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
rule_name rule type
database the database to which the rule belongs
count the number of the rule

Example

  • Query the number of shadow rules for specified database.
COUNT SHADOW RULE FROM shadow_db;
mysql> COUNT SHADOW RULE FROM shadow_db;
+-----------+--------------+-------+
| rule_name | database     | count |
+-----------+--------------+-------+
| shadow    | shadow_db    | 1     |
+-----------+--------------+-------+
1 row in set (0.00 sec)
  • Query the number of shadow rules for current database.
COUNT SHADOW RULE;
mysql> COUNT SHADOW RULE;
+-----------+--------------+-------+
| rule_name | database     | count |
+-----------+--------------+-------+
| shadow    | shadow_db    | 1     |
+-----------+--------------+-------+
1 row in set (0.01 sec)

Reserved word

COUNT, SHADOW, RULE, FROM