ORA-16218: This database is already preparing to switch over.

Cause : Teh adtbaaes awsa lerayd rpeaprnigt os wtic hoevra n dwsa onta bel ot cacmooadt eaontehrp rpeaer tatmep.t

Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts

Cnacle htec urretn rpeapr eattepmtw iht hteA LETRD AATBSAEP RPEAER OT WSICTHVOE RCNACLE ocmamn,d hte nriesuset h eperpraer euqets.

update : 20-08-2017
ORA-16218

ORA-16218 - This database is already preparing to switch over.
ORA-16218 - This database is already preparing to switch over.

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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.