To drop a 2 node RAC database, please follow attached process

1. Database Decommission Process
 Please note below activity is reference to 2 node RAC.
 Verify recent backup of the database (Latest Backup). If exist, please ignore otherwise run RMAN full backup
 Connect to EM Console (sysman/***) and Block out Database cluster
 Comment/Remove all entries in CronTab belongs to the database which will under-go decommission process
 Connect to Oracle Node1
-bash-3.2$ sqlplus / as sysdba
SQL*Plus: Release 11.2.0.1.0 Production on Mon Nov 26 22:28:28 2012
Copyright (c) 1982, 2009, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 – 64bit Production
With the Partitioning, Real Application Clusters, OLAP, Data Mining and Real Application Testing options
Use the below commands to verify database and instance details.
 Ensure to check the DB name which will be processed for decommission
SQL> select dbid, name from v$database;
SQL> select INSTANCE_NUMBER, INSTANCE_NAME from v$instance;
 Shutdown the Database on node-2
-bash-3.2$ sqlplus / as sysdba
SQL*Plus: Release 11.2.0.1.0 Production on Mon Nov 26 22:31:05 2012
Copyright (c) 1982, 2009, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 – 64bit Production
With the Partitioning, Real Application Clusters, OLAP, Data Mining
and Real Application Testing options
 Ensure to check the DB name which will be processed for decommission
SQL> select dbid, name from v$database;
SQL> select INSTANCE_NUMBER, INSTANCE_NAME from v$instance;
SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
 Startup database in restricted mode on node-1 to avoid any new connections to DB
 Connect to Node -1
SQL> select dbid, name from v$database;
SQL> select INSTANCE_NUMBER, INSTANCE_NAME from v$instance;
SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup mount RESTRICT;
ORACLE instance started.
Total System Global Area 263049216 bytes
Fixed Size 2212448 bytes
Variable Size 201330080 bytes
Database Buffers 54525952 bytes
Redo Buffers 4980736 bytes
Database mounted.
 Drop database from node-1
SQL> alter system set cluster_database=FALSE scope=spfile;
System altered.
 Create pfile from spfile
SQL> create pfile from spfile;
File created.
 Connect to DB in same node, now if we observe we will be connected to “idle” instance
-bash-3.2$ sqlplus / as sysdba
SQL*Plus: Release 11.2.0.1.0 Production on Mon Nov 26 22:48:38 2012
Copyright (c) 1982, 2009, Oracle. All rights reserved.
Connected to an idle instance.

2. Database Decommission Process
 Start up the DB in mount stage with created PFILE by providing its location as below shown
SQL> STARTUP pfile=$ORACLE_HOME/dbs/initdbname.ora MOUNT RESTRICT;
ORACLE instance started.
Total System Global Area 263049216 bytes
Fixed Size 2212448 bytes
Variable Size 201330080 bytes
Database Buffers 54525952 bytes
Redo Buffers 4980736 bytes
Database mounted.
 Cross verify the instance name before drop
SQL> show parameter instance_name from v$database;
SQL> drop database;
Database dropped
 Now that DB is dropped, let us remove the services & instances, from OS level using below commands.
$srvctl remove instance -d <database name> -i <instance name> -f
$srvctl remove instance -d <database name> -i <instance name> -f
 As we removed instances, let us remove services associated with them, before removing check the services running in the server
$ crs_stat.sh |grep -i <DB name>(to check CRS services)
ora.<DB_Name>.<DB_Name>_app.svc OFFLINE OFFLINE <hostname> STABLE
ora.<DB_Name>.<DB_Name>_app.svc OFFLINE OFFLINE <hostname> STABLE
ora.<DB_Name>.<DB_Name>_bat.svc OFFLINE OFFLINE <hostname> STABLE
ora.<DB_Name>.<DB_Name>_bat.svc OFFLINE OFFLINE <hostname> STABLE
ora.<DB_Name>.db OFFLINE OFFLINE <hostname> Instance Shutdown,ST
 Above is the output expected from “grep” command Now, let’s remove these services to complete DB decommission by using below commands at server
level
$srvctl remove service -d <DB_Name> -s <DB_Name>_app
$srvctl remove service -d <DB_Name> -s <DB_Name>_bat
$srvctl remove database -d <DB_Name>
 Finally, remove the target from Oracle Enterprise Management
Done!!!