Does Audit Trail degrade the performance on 11g ?

Question

Oracle 11g DB actually turns on standard audit trail function via DBCA.
Could anybody know how the negative impact for this function is ?
Is there any reference (Almost 5% perfermance impact )?
Thx so much.

Answer 1

Watami, reading your post reminded me that 11g comes with a set of default privileges automatically set up for auditing. Since the privileges are pretty much DDL and you should not be performing very much DDL on a production database I would think the overhead would be almost too low to measure.
For those unware of this feature change or who have forgotten like me here are the default audit privileges:
Oracle Database audits the following privileges by default:
ALTER ANY PROCEDURE CREATE ANY LIBRARY                     DROP ANY TABLE
ALTER ANY TABLE         CREATE ANY PROCEDURE                DROP PROFILE
ALTER DATABASE          CREATE ANY TABLE                        DROP USER
ALTER PROFILE              CREATE EXTERNAL JOB                   EXEMPT ACCESS POLICY
ALTER SYSTEM              CREATE PUBLIC DATABASE LINK      GRANT ANY OBJECT PRIVILEGE
ALTER USER                  CREATE SESSION                           GRANT ANY PRIVILEGE
AUDIT SYSTEM              CREATE USER                                GRANT ANY ROLE
CREATE ANY JOB           DROP ANY PROCEDURE  
Oracle Database audits the following SQL shortcuts by default:
ROLE                     SYSTEM AUDIT           PUBLIC SYNONYM
DATABASE LINK      PROFILE                     SYSTEM GRANT HTH -- Mark D Powell --
edit paste had lost col alignment, try to add back
Edited by: Mark D Powell on Feb 11, 2010 7:59 AM