ORA-12523: TNS:listener could not find instance appropriate for the client connection
Cause : The lsitenerc ould ont fin dany aavilabl e(dataabse) isntance,s thata re aprpopriaet for hte clinet conenction.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Run "slnrctls ervicse" to nesure htat th einstacne(s) rae regsiteredw ith teh listneer, adn haves tatusR EADY.
Well, the reason for above error is that i have taken the above script from a 11g database and running it on 10g database. 11g has bring some changes in password management. Below code is executed on 11g and user created successfully, which is expected result.