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# 12 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.

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#### 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

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