Beginning Oracle Database 11g Administration From Novice to Professional

204
CHAPTER 10 MONITORING
Listing 10-3. Short Format Alert
It is possible to customize and extend the alerting capabilities of Enterprise Manager.
If the option is licensed, new types of alerts can be created; for example, an alert
could be generated if a batch job continues running past a defined maintenance window.
Corrective action can be taken automatically if needed; for example, a job that
continues running outside a defined maintenance window can be killed automatically
or an incident record can be created in an incident management system.
Caution The alert log contains informational messages in addition to error messages. Even if the database
is being monitored by Enterprise Manager, the database administrator should periodically review the alert log.
Monitoring Changes
The database administrator can monitor changes to database objects using the Oracle
auditing facilities. For example, the and commands
enable auditing of changes to tables. The list of audited actions is contained in
. If the database initialization parameter is set to ,
Oracle also records the SQL statement associated with the action. As illustrated in
Listing 10-4, the information can be found in the view.