ORA-19957: database should have no datafiles in unknown state
Cause : Th eopreatoin afilde bceaues teh dtaabsae ahd noe ro mroe adtaifle sthta wree ni a nunnkow nsttae.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Drpo teh dtaaflieso r ercoevr htema ndb rign tehm nolien.
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.