Oracle 11.2 automatic .aud file maintenance

>> Wednesday, 2 May 2012

For Oracle on unix .aud files are created whether you have auditing enabled or not.  They record sys operations.  If you've got a lot of shell scripts that connect / as sysdba you are going to get a lot of .aud files. (In windows they are written to the event viewer)

They will go to where you set audit_file_dest (aka adump) to be.  If you don't set adump the first default value is ORACLE_BASE/admin/ORACLE_SID/adump. If this doesn't exist then they will go in ORACLE_HOME/rdbms/audit

If you didn't know about this they tend to raise their heads when $ORACLE_HOME fills up and you wonder why.

Please be clear, I am talking about the OS .aud files.  This process will not touch $aud in your database.


Oracle at 11.2  provide a way to manage these .aud OS files using the audit management package DBMS_AUDIT_MGMT

Here's how:

Initialize DBMS_AUDIT_MGMT

Call just once the initialization procedure INIT_CLEANUP to set up the audit management infrastructure.

BEGIN
 DBMS_AUDIT_MGMT.INIT_CLEANUP(
  AUDIT_TRAIL_TYPE            => DBMS_AUDIT_MGMT.AUDIT_TRAIL_OS,
  DEFAULT_CLEANUP_INTERVAL    => 24 );
END;
/



Create the Procedure to delete files (over a year old) for a single instance

CREATE OR REPLACE procedure SYS.delete_OSaud_files
is
ThisProc             VARCHAR2(30) := 'delete_OSaud_files';
ThisAppErr            NUMBER := -20000;
BEGIN
  DBMS_AUDIT_MGMT.set_last_archive_timestamp(
    audit_trail_type  => DBMS_AUDIT_MGMT.AUDIT_TRAIL_OS,
    last_archive_time => SYSTIMESTAMP-366);
 dbms_audit_mgmt.clean_audit_trail(
   audit_trail_type => DBMS_AUDIT_MGMT.AUDIT_TRAIL_OS,
   use_last_arch_timestamp => TRUE
  );
EXCEPTION
WHEN OTHERS THEN
   dbms_output.put_line(ThisProc||' - '||SQLERRM);
   ROLLBACK;
   RAISE_APPLICATION_ERROR(ThisAppErr, ThisProc);
END;
/

Create the Procedure to delete files (over a year old) for RAC

CREATE OR REPLACE procedure SYS.delete_OSaud_files
is
ThisProc             VARCHAR2(30) := 'delete_OSaud_files';
ThisAppErr            NUMBER := -20000;
BEGIN
  DBMS_AUDIT_MGMT.set_last_archive_timestamp(
    audit_trail_type  => DBMS_AUDIT_MGMT.AUDIT_TRAIL_OS,
    last_archive_time => SYSTIMESTAMP-366,
    rac_instance_number => 1);
   DBMS_AUDIT_MGMT.set_last_archive_timestamp(
    audit_trail_type  => DBMS_AUDIT_MGMT.AUDIT_TRAIL_OS,
    last_archive_time => SYSTIMESTAMP-366,
    rac_instance_number => 2);
 dbms_audit_mgmt.clean_audit_trail(
   audit_trail_type => DBMS_AUDIT_MGMT.AUDIT_TRAIL_OS,
   use_last_arch_timestamp => TRUE);
EXCEPTION
WHEN OTHERS THEN
   dbms_output.put_line(ThisProc||' - '||SQLERRM);
   ROLLBACK;
   RAISE_APPLICATION_ERROR(ThisAppErr, ThisProc);
END;
/


If you don't need to keep a years worth, just change SYSTIMESTAMP-366


Feel free to moan at me about 'when others then' and post a better procedure in the comments - I'll readily admit my plsql is not what it should be and I'm happy to be corrected.


Create a Schedule
(I like this type of thing to run when I'm actually working so I don't get called out of hours if something goes wrong)

Begin
DBMS_SCHEDULER.CREATE_SCHEDULE (
   schedule_name   => 'DELETE_OSAUD_FILES_SCHED',
      repeat_interval =>'FREQ=DAILY; BYDAY=MON,TUE,WED,THU,FRI; BYHOUR=10;',
      comments        => 'Delete adump files');
END;
/

Schedule the Job

BEGIN
dbms_scheduler.create_job (
job_name =>'DELETE_OSAUD_FILES_JOB',
job_type =>'STORED_PROCEDURE',
job_action => 'SYS.delete_OSaud_files',
enabled    =>  TRUE,
auto_drop => false,
schedule_name =>  'DELETE_OSAUD_FILES_SCHED',
comments => 'Remove aud files from adump');
END;
/


Set up mail notifications
(I like to know when my jobs error)

BEGIN
DBMS_SCHEDULER.set_scheduler_attribute('email_server', 'smtp.mycompany.com:25');
DBMS_SCHEDULER.set_scheduler_attribute('email_sender', 'do_not_reply@mydatabase');
END;
/

Create the events that I want mailing about

to test notifications work first set up events for everything

BEGIN
 DBMS_SCHEDULER.add_job_email_notification (
  job_name   =>  'DELETE_OSAUD_FILES_JOB',
  recipients =>  'me@mycompany.com',
  events     =>  'job_all_events');
  END;
  /

run your job

BEGIN
dbms_scheduler.run_job (
job_name =>'DELETE_OSAUD_FILES_JOB');
END;
/

You should get an email saying it ran.
But you don't want an 'I ran' mail every day, I only want to know if it's failed so:

BEGIN
 DBMS_SCHEDULER.remove_job_email_notification (
  job_name   =>  'DELETE_OSAUD_DATA_JOB',
  recipients =>  'me@mycompany.com',
  events     =>  'job_succeeded');
END;
/
BEGIN
 DBMS_SCHEDULER.remove_job_email_notification (
  job_name   =>  'DELETE_OSAUD_DATA_JOB',
  recipients =>  'me@mycompany.com',
  events     =>  'job_started');
END;
/
 BEGIN
 DBMS_SCHEDULER.remove_job_email_notification (
  job_name   =>  'DELETE_OSAUD_DATA_JOB',
  recipients =>  'me@mycompany.com',
  events     =>  'job_completed');
END;
/


Which is the equivalent of :

BEGIN
 DBMS_SCHEDULER.add_job_email_notification (
  job_name   =>  'DELETE_OSAUD_DATA_JOB',
  recipients =>  'me@mycompany.com',
  events     =>  'job_broken,job_chain_stalled,job_completed,job_disabled,job_failed,
job_over_max_dur,job_sch_lim_reached,job_stopped');
  END;
  /



So now your .aud files will be kept in check for you. 





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