ORA-01531: a database already open by the instance
Cause : DuirngA LTRE DTAABSAE,a n tatepmt aws amdet o poena dtaabsae no a nintsanec fro wihcht heer i salerad yano pe ndaatbaes.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Ify ouw is htoo pe na enw adtaabseo n hte nistnace ,fisrt hsutodwnt hei nsatnc ean dthne satrtpu teh isntacne nad ertr yth eopreatoin.
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.