Quote Originally Posted by Thomas7 View Post
1) How to generate large no of user's work load?
Look for a workload generator/simulator. Plenty of offer.

Quote Originally Posted by Thomas7 View Post
2) How to test the queries are using optimal execution plans.
Looking at them, one at a time.

Quote Originally Posted by Thomas7 View Post
3) As my test Database is smaller than Prod, how can I ensure Test performance will also be optimal on PROD.
You can't.