My name is not Anitha. 
I don’t regularly run reports from the data from the logs, so I can’t give you lots of specifics, sorry. I do know that in version 5, it seemed like information was sometimes catch-as-catch-can. Perhaps someone who runs such reports a lot from the logs-into-the-database can give you more specific advice.
In the meantime, you could take a look at the “Report on WebI Audit information” from BOB’s Downloads, which I believe is specifically for 5.1.x.
Anita Craig 
(BOB member since 2002-06-17)