Oracle 9i Actions Audited by Default
I am referring to the document located on following link
http://download.oracle.com/docs/cd/B10501_01/server.920/a96521/audit.htm#13370
Which states as follows
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Actions Audited by Default
Regardless of whether database auditing is enabled, Oracle always audits certain database-related operations and writes them to the operating system audit file. These operations include the following:
An audit record is generated that lists the operating system user connecting to Oracle as
<span style="font-size: 10pt;">SYSOPER</span>
or
<span style="font-size: 10pt;">SYSDBA</span>
. This provides for accountability of users with administrative privileges. Full auditing for these users can be enabled as explained in