The COUNT DB_DISCOVERY RULE syntax is used to query the number of database discovery rules for specified database.
CountDBDiscoveryRule::=
'COUNT' 'DB_DISCOVERY' 'RULE' ('FROM' databaseName)?
databaseName ::=
identifier
databaseName is not specified, the default is the currently used DATABASE. If DATABASE is not used, No database selected will be prompted.| Column | Description |
|---|---|
| rule_name | rule type |
| database | the database to which the rule belongs |
| count | the number of the rule |
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)
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)
COUNT, DB_DISCOVERY, RULE, FROM