What is the alert log?

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Each database has an alert log file, which contains a chronological(sequential order in which they occurred) log of database messages and errors. Oracle will automatically create a new alert log file whenever the old one is deleted.

The alert log includes the following errors and log messages:

  • All internal errors (ORA-600), block corruption errors (ORA-1578), and deadlock errors (ORA-60).
  • Administrative operations such as DDL statements and the SQL*Plus commands STARTUP, SHUTDOWN, ARCHIVE LOG, and RECOVER.
  • Several messages and errors relating to the functions of shared server and dispatcher processes.
  • Errors during the automatic refresh of a materialized view

Find the Location of alert log file in Oracle

To view alert log, first you need to find it’s location using select command.

SQL> SELECT VALUE FROM V$DIAG_INFO WHERE NAME = 'Diag Trace';

VALUE

--------------------------------------------------------------------------------

/u01/app/oracle/diag/rdbms/orcl/orcl/trace

To view alert log you can use tail command 

[oracle@localhost ~]$ cd /u01/app/oracle/diag/rdbms/orcl/orcl/trace

[oracle@localhost trace]$ tail -100f alert_orcl.log 


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