Here's a good starting point, from Oracle Docs, but there are other sources too numerous to mention here: https://docs.oracle.com/cd/B28359_01/server.111/b28337/tdpsg_auditing.htm#TDPSG50522 Stay away from audit levels that attempt to track activity that occurs frequently... e.g. it's one thing to track Alter System activity, but it may be quite another to try and track Alter Any Table (likely lots more audit entries for this one.)
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