Question about *.aud in audit_file_dest fields

A node 3 RAC 11 g 2 on Linux 5.2, we recently had a full disk because of too many files in audit_file_dest. The parameter audit database is such
SQL> show parameter audit

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
audit_file_dest                      string      /u01/app/oracle/admin/prdcch/adump
audit_sys_operations                 boolean     FALSE
audit_syslog_level                   string
audit_trail                          string      DB
With audit_sys_operations = FALSE, I don't expect operating SYS written to audit_file_dest. But in fact we still see a lot. Here are my questions about sys audit
(1) how really turn off sys audit
(2) I see much usefule sys files in audit_file_dest of the audit. A typical such file contained as (removded header)
Sat Jul  2 19:15:22 2011 -05:00
LENGTH : '155'
ACTION :[7] 'CONNECT'
DATABASE USER:[1] '/'
PRIVILEGE :[6] 'SYSDBA'
CLIENT USER:[6] 'oracle'
CLIENT TERMINAL:[0] ''
STATUS:[1] '0'
DBID:[10] '2362038599'
From what I understand, it tells me the time and duration of the session SYS. It don't me didn't say where machine (which can help to identify who connected in a SYS), not the activities
 I find this info is useless. I must missed something important, hope some one can shine some light here.
3) If cannot stop the SYS audit, I would like to redrect the audit_file_dest to a differnt drive with larger space. Is there anything thing need special attention when doing it in RAC. Can each instance has differnt audit_file_dest?

Thanks                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        

Although audit_sys_operations is false, some actions are audited by default in 11g. See also DBA_AUDIT_TRAIL.
(1) you can't turn it off
(2) TERMINAL CLIENT is empty, it means that the connection of the server itself. In your example someone logged on locally as "/ as sysdba".
(3) audit_file_dest is instance specific. You can put each in their own directory or put them all in a share. If the files are very small, according to the activity of DB there could be millions of them. In my environment remove us periodically as they age (more than 3 months).

Tags: Database

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