Hi Vivek,

1.)Is the same script runs 100 times for same UID/PWD what i have entered during Recording

Ans - Yes the same script is running.

2.)If my data base contains only 50 users.Selecting 100 Vusers is a valid case?.

Ans - Yes it is a valid case because it id not going to your DB to fetch records as it is only generating the load.

If you want to login as 100 different users then you have to paramterize the script and then pass 100 users in an excel.

3.)If i have selected 100 Vusers,is it necessary to enter 100 UID/PWD.
Ans - No it is not necessary.

Vivek it is a better practice that for any specific role(User Type) you may put the data in an XLS and then call that XLS in the program. This will imitate a real life condition.