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.

update : 24-04-2017
ORA-01531

ORA-01531 - a database already open by the instance
ORA-01531 - a database already open by the instance

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    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.