p.swathi4 (8/17/2013)
How to find the queries thats causing tempdb fill very often.
It's a fairly large subject so you need to ask your assistant DBA the question. In fact, you and I have the same assistant DBA... His first name is "Google". 😀
Seriously... go to Google and type in "find the queries thats causing tempdb fill" (the exact wording of part of your question) and you'll find a lot of posts on the subject.
One of the MS White Papers on the subject has a wealth of data concerning this problem. It also has a method for helping to track down things that are using TempDB the most near the end of the paper. Here's the URL for that.
http://technet.microsoft.com/library/Cc966545#EGAA
As a bit of a sidebar, many people have written queries to attempt to find out what's causing TempDB to grow. I've not tested the query at the following link but it's written someone that I have high regard for.
http://www.sqlservercentral.com/scripts/tempdb/72007/
--Jeff Moden
Change is inevitable... Change for the better is not.