Application Express User's Guide > Understanding Application A... > Managing Log Files
Log entries older then one month are automatically deleted. You can also manually purge log files on the Manage Logs page.
To purge log files, you must have a database account that has been granted a DBA role.
Topics:
Truncating Page Views
Purging the External Clicks Log
Purging the Builder Activity Log
Deleting SQL History Logs
Deleting SQL Script Execution Logs