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COUNT DB_DISCOVERY RULE

Description

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

Syntax

CountDBDiscoveryRule::=
  'COUNT' 'DB_DISCOVERY' '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 database discovery rules for specified database.
COUNT DB_DISCOVERY RULE FROM discovery_db;
mysql> COUNT DB_DISCOVERY RULE FROM discovery_db;
+--------------+-----------------+-------+
| rule_name    | database        | count |
+--------------+-----------------+-------+
| db_discovery | discovery_db    | 1     |
+--------------+-----------------+-------+
1 row in set (0.00 sec)
  • Query the number of database discovery rules for current database.
COUNT DB_DISCOVERY RULE;
mysql> COUNT DB_DISCOVERY RULE;
+--------------+-----------------+-------+
| rule_name    | database        | count |
+--------------+-----------------+-------+
| db_discovery | discovery_db    | 1     |
+--------------+-----------------+-------+
1 row in set (0.00 sec)

Reserved word

COUNT, DB_DISCOVERY, RULE, FROM