OK, then I must appologize to you. I was sure as hell that you had a Z-program or had manipulated the database. That does happen very often by people called "ask" and "basis basis", but you are actually "a sk".. -> Arun Siva Kumar
Anyway, you should be able to put humpty dumpty together again by checking the change documents via report RSUSR100N. Trick will be that all users locked where USR02-UFLAG was 0 before hand will need to be unlocked, plus also those with 128 because only the password was locked or when the password had been deactivated (eg. batch users or SSO is used).
As of release 7.31 there is a much better solution -> you can define a special security policy in transaction SECPOL and assign it to the admins who should be able to logon. Then via RZ11 parameter login/server_logon_restriction you can block all new logons without having to process all the user master records each time. See SAP Note 1891583.
Cheers and sorry again for misinterpreting your question about "production activity".
Julius