Audit Trail in Oracle 11gR2 I'm using Oracle 11g R2 on RHEL5. 

How can I find what is being audited? I want to know what actions (like create, insert, delete, update etc.) are being audited or logged for a user, say scott.
This topic is documented in the Oracle Security Guide at the section Finding Information About Audited Activities.

In your case you should find useful the catalog view DBA_OBJ_AUDIT_OPTS which displays the objects on which auditing options have been enabled.

Here is described the view structure.