ERROR
CREATE CONTROLFILE .................................
.................................................
CHARACTER SET AL32UTF8;
ERROR at line 1:
ORA-01503: CREATE CONTROLFILE failed
ORA-12720: operation requires database is in EXCLUSIVE mode
SOLUTION
SQL> alter system set cluster_database=FALSE scope=spfile sid='*'; SQL> shutdown immediate; SQL>startup nomount;
Now, re-run script for creating controlfile
CREATE CONTROLFILE ................................. ................................................. CHARACTER SET AL32UTF8; Control file created.
Then, change parameter with its old value and restart database.
SQL>alter system set cluster_database=TRUE scope=spfile sid='*';