Meenakshi,
I do my own auditing by running a few onstat commands every 5 minutes,
daily, or weekly (depending on the onstat command) and save the outputs
by time stamp. This way, I can go back and see what changes happened
when. Cron'ing a few onstat's is simple and easy, if you do not want
to dig into Informix auditing.
This may not help you now. But by setting something up, it may save
you in the future. It has for me.
Nick