14 Database error handling
If Zabbix detects that the backend database is not accessible, it will send a notification message and continue the attempts to connect to the database. For some database engines, specific error codes are recognized.
MySQL
CR_CONN_HOST_ERROR
CR_SERVER_GONE_ERROR
CR_CONNECTION_ERROR
CR_SERVER_LOST
CR_UNKNOWN_HOST
ER_SERVER_SHUTDOWN
ER_ACCESS_DENIED_ERROR
ER_ILLEGAL_GRANT_FOR_TABLE
ER_TABLEACCESS_DENIED_ERROR
ER_UNKNOWN_ERROR