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Oracle Database/Performance Monitoring
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On the oracle database Web administration tool, there is a usage monitor shown on the right-hand side of the screen. This displays both the Storage used by Oracle and the current Memory in use. It also lists the total sessions and users.
For a more detailed view of server settings, Enter the Administration section, and open the Monitor.
Sessions displays a list of users currently connected to the database.
System Statistics displays the current resources used by the database. It can also be set to display changes within the statistics from a given reference point.
Top SQL displays a list of previous SQL statements that are the most resource intensive.
Long Operations displays the status of operations that are taking more than 6 seconds.
Troubleshooting invalid and unusable objects
Gathering optimizer statistics
Viewing performance metrics
Reacting to performance issues