| FACILITY | VARCHAR2(24) | Facility that encountered the event: 
Crash Recovery
Log Transport Services
Log Apply Services
Role Management Services
Remote File Server
Fetch Archive Log
Data Guard
Network Services
 | 
| SEVERITY | VARCHAR2(13) | Severity of the event: 
Informational- Informational message
Warning- Warning message
Error- Indicates the process has failed
Fatal
Control- An expected change in state such as the start or completion of an archival, log recovery, or switchover operation
 | 
| DEST_ID | NUMBER | Destination ID number to which the event pertains. If the event does not pertain to a particular destination, then the value is 0. | 
| MESSAGE_NUM | NUMBER | A chronologically increasing number giving each event a unique number | 
| ERROR_CODE | NUMBER | Error ID pertaining to the event | 
| CALLOUT | VARCHAR2(3) | Reserved for future use | 
| TIMESTAMP | DATE | Message date | 
| MESSAGE | VARCHAR2(256) | A text message describing the event |