ORA-12913: Cannot create dictionary managed tablespace

 ORA-12913: Cannot create dictionary managed tablespace

i case your problem regarding not able to create dictionary managed tablespace has not been solved then just look at your system tablespace weather it is locally managed or dictionary. according to me it should be locally managed. once you switch your system tablespace as locally managed then you cannot create any dictionary managed tablespace in your database, and there is no way to switch your system tablespace back to local from dictionary managed once you have made it locally managed. It might be possible that you have not made the system tablespace locally managed but if you have created the database from DBCA i.e. database configuration asisstant then it automatically creates the system tablespace locally managed........ so don't panic.....