oracle9.2.0.3 audit help!!!!!!!

I'm new in oracle. I would like to control which user modyficates which
tables,etc(mainly jppm by hibernate). I tried to configure audit such way:

I set value AUDIT_TRAIL = true in
%ORACLE_HOME/admin/<myDatabase>/pfile/%init.ora (it dosen't work. After
setting

audit for some users, restarting database, and making
some operations on tables , the default table sys.aud$ was empty)

I set value AUDIT_TRAIL = db (the same situation)

I set value

AUDIT_TRAIL = os

AUDIT_FILE_DEST= 'C:\audit' ( I didn't see any new log file in
that directory )

I have the impression that oracle doesn't write this file during starting.

What did I making wrong ?

Does sombody know diffrent,way to could see past users' operations in
database?



Regards.

Artur M.


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