Trace who remove dba_jobs

Hi guys,

I have "CSI" task need to discuss with you.

Some one remove dba_jobs, it is Oracle 8i how can I know who remove the job
and what time,

I have collected:
1. Complete listener.log
2. I tried to select * from v$sql and v$sql_are where sql_text like
dbms_job.remove but find nothing.
3. no audit :(
4. no archive can't do log mining :(



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