ORA-12720: operation requires database is in EXCLUSIVE mode

PROBLEM

When I try to create an controlfile for a RAC database using the CONTROLFILE Trace. I was throw with the below error message

SQL> @c.sql

CREATE CONTROLFILE REUSE DATABASE "XE1" RESETLOGS FORCE LOGGING ARCHIVELOG

*

ERROR at line 1:

ORA-01503: CREATE CONTROLFILE failed

ORA-12720: operation requires database is in EXCLUSIVE mode

SOLUTION

After analyzing the issue, I found that cluster_database parameter needs to be set as FALSE. So I am proceeding with the change.

SQL> alter system set cluster_database=FALSE scope=spfile sid='*';

System altered.

SQL> shutdown abort;

ORACLE instance shut down.

SQL>

SQL> exit

Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production

With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP,

Data Mining and Real Application Testing options

STARTING THE DATABASE

$sqlplus / as sysdba

SQL*Plus: Release 11.2.0.2.0 Production on Fri Nov 11 14:30:58 2011

Copyright (c) 1982, 2010, Oracle.  All rights reserved.

Connected to an idle instance.

SQL> startup nomount

ORA-32004: obsolete or deprecated parameter(s) specified for RDBMS instance

ORACLE instance started.

Total System Global Area 1.4431E+10 bytes

Fixed Size                  2240272 bytes

Variable Size            3892314352 bytes

Database Buffers         1.0503E+10 bytes

Redo Buffers               34148352 bytes

SQL> @c.sql

Control file created.

Once the controlfile created and open the database, I have change the parameter to TRUE

SQL> alter system set cluster_database=TRUE scope=spfile sid='*';

Once you issue the command, you need to bounce the DB.