Enable Archivelog mode on Oracle11g R2 RAC environment

Today I want to show you how to enable archivelog mode on Oracle 11g R2 RAC environment.

1. Checking log_mode:

 [oracle@rac1 acfs]$ export ORACLE_SID=RAC1  
 [oracle@rac1 acfs]$ sqlplus "/as sysdba"  
 SQL> archive log list  
 Database log mode No Archive Mode  
 Automatic archival Disabled  
 Archive destination USE_DB_RECOVERY_FILE_DEST  
 Oldest online log sequence 9  
 Current log sequence 10  
 SQL>  

[oracle@rac2 acfs]$ export ORACLE_SID=RAC2  
 [oracle@rac2 acfs]$ sqlplus "/as sysdba"  
 SQL*Plus: Release 11.2.0.1.0 Production on Mon Oct 13 18:13:53 2014  
 Copyright (c) 1982, 2009, Oracle. All rights reserved.  
 Connected to:  
 Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production  
 With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP,  
 Data Mining and Real Application Testing options  
 SQL> select name, open_mode, log_mode from v$database;  
 NAME   OPEN_MODE      LOG_MODE    
 --------- -------------------- ------------  
 RAC    READ WRITE      NOARCHIVELOG  
 SQL>  

Using SRVCTL utility stop cluster database

 [oracle@rac1 ~]$ srvctl stop database -d RAC  

--checking statuses

[oracle@rac1 ~]$ srvctl status database -d RAC  
 Instance RAC1 is not running on node rac1  
 Instance RAC2 is not running on node rac2  

Connect to node 1 and startup instance on mount mode, enable archiving and at the end shutdown the instance:

 SQL> startup mount  
 ORACLE instance started.  
 Total System Global Area 849530880 bytes  
 Fixed Size         1339824 bytes  
 Variable Size       570429008 bytes  
 Database Buffers     272629760 bytes  
 Redo Buffers        5132288 bytes  
 Database mounted.  
 SQL> ALTER DATABASE ARCHIVELOG;  
 SQL> SHUTDOWN IMMEDIATE;  

As you know we have shared files between instances so, this operation only has to be done from a single node.

Now start the clustered database

 [oracle@rac1 ~]$ srvctl start database -d RAC  
 [oracle@rac1 ~]$ srvctl status database -d RAC  
 Instance RAC1 is running on node rac1  
 Instance RAC2 is running on node rac2 

--Check again on both nodes

 SQL> select name, open_mode, log_mode, instance_name from v$database, v$instance;  
 NAME   OPEN_MODE      LOG_MODE   INSTANCE_NAME  
 --------- -------------------- ------------ ----------------  
 RAC    READ WRITE      ARCHIVELOG  RAC1  

 SQL> select name, open_mode, log_mode, instance_name from v$database, v$instance;  
 NAME   OPEN_MODE      LOG_MODE   INSTANCE_NAME  
 --------- -------------------- ------------ ----------------  
 RAC    READ WRITE      ARCHIVELOG  RAC2  
 SQL>  

That`s all.