Auditing user activity in Oracle 9i

Question

I need to provide some kind of measure of user activity in our Oracle DB.
Essentially we are trying to find low consumers who perhaps have little or no need for access to the database, perhaps they do one enquiry a day or only access information once a week.
However, if they log in every day, all day, it doesn't necessary mean they are a havy user of the database, they may never actually query or update anything.
With that in mind, is it possible to provide activity auditing in Oracle 9i, with new or existing procedures?
For one application our users share an Oracle account but their OS User would always identify them.
So ultimately I would like to report:
For last week Oracle DB usage of database XYZ is:
User Os User Consumption
ADAM Adam 1000
GSPAM SpamG 900
SLACKA ASlack 877
PINT ASlack 876
PINT Adam 854
I have no idea one might measure consumption!
Thanks

Answer 1

cubittm, I have done what you are asking about.
Depending on how much detail you want you can set up database event logon and logoff triggers to capture this information.
On logoff you update a statistics row with the values from v$sesstat for the logging off session for those statistics you want to measure. Note, you will not be able to capture statistics for session that abnormally terminate since the logoff trigger does not fire in that case.
All you actually need is a logoff trigger and one row per user to get totals. If you want details then you need one row per day or a set of rows for every logon/logoff depending on how much detail you want to collect.
If you generate data for every logon/logoff the data quantity can build up very fast depending on your application user load. If the target table fills then no one can logon so make sure you have adequate space available and a purge process. This process will not work very well if everyone logs in via a single application id and connection pooling is in use.
HTH -- Mark D Powell --