Square DBA – Oracle DBA Talk

Because I love to do things in the database I write little script and functions to keep me in SQLplus. Access the Alert Log is no different. In reality I access the Alert Log inside and outside the database. It’s too important to monitor in one place.

Starting in Oracle9i you can map external flat files to Oracle tables.
Mapping the Oracle alert log is easy and once defined, all you have to do is query it with standard SQL syntax:

create directory BDUMP as '/u01/app/oracle/admin/mysid/bdump';

create table
   alert_log ( msg varchar2(80) )
organization external (
   type oracle_loader
   default directory BDUMP
   access parameters (
      records delimited by newline
   )
   location('alrt_mysid.log')
)
reject limit 1000;

Now we can easily extract important Oracle alert log information without leaving SQL*Plus:

select msg from alert_log where msg like '%ORA-00600%';