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Oracle Tips by Burleson

Chapter 9 Oracle System Event Trigger Auditing

Introduction

Some of the most exciting new features within Oracle are the new system-level triggers that were introduced in Oracle8i. What is truly exciting is that we can combine the system-level triggers with STATSPACK extension tables, thereby building a mechanism that will give complete auditing information on user logon and logoff, DDL, and server errors.

Just as an Oracle trigger fires on a specific DM event, system-level triggers are fired at specific system events such as logon, logoff, database startup, DDL execution, and servererror triggers:

  • Database startup triggers - Database startup triggers can be used to invoke the dbms_shared_pool.keep procedure to pin all frequently referenced PL/SQL packages into RAM.
     

  • Logon triggers - The logon triggers can be used to store login information directly inside Oracle tables, thereby providing a complete audit of when users enter your system.
     

  • Logoff triggers -- Oracle logoff triggers can automatically capture elapsed session duration times for all users who have accessed your Oracle database.
     

  • Servererror triggers -- With the servererror trigger, the Oracle administrator can automatically log all serious PL/SQL errors into an Oracle STATSPACK extension table. This table, in turn, has an insert trigger that e-mails the server error to the DBA for immediate notification.


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