Auditing on or off
An audit administrator determines whether auditing is on or off. Auditing is turned off by default when the database server is installed. As Audit administration, describes, the AAO can turn auditing on and off at any time, by using the onaudit utility, which The onaudit utility: Configure audit masks, describes. The database server can be in either online or quiescent mode for the changes to take effect.
When the AAO turns on auditing, all sessions, new and current, start auditing auditable events. Both existing sessions and new sessions produce records. All user sessions that are started thereafter also produce audit records.
Similarly, when the AAO turns off auditing, auditing stops for all existing sessions, and new sessions are not audited. If the AAO turns off auditing and then turns it on again while the database server is in online mode, existing sessions resume producing audit records.