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