Configure Archivelog in RAC Database

Steps to configure ARCHIVELOG mode from NOARCHIVELOG mode.

Database name: gcprod
Instance 1: gcprod1
Instance 2: gcprod2

Step 1: Set the Environment Variable
$ hostname
node1
$ export ORACLE_SID=gcprod1
$ sqlplus system @ gcprod1
password:

Step 2: Disable Cluster

SQL> alter system set CLUSTER_DATABASE=FALSE scope=spfile;
system altered

Step 3: Set the parameters

SQL> alter system set LOG_ARCHIVE_FORMAT= 'gcprod_%t_%s_%r.arc' scope=spfile;
system altered

Step 4: Shutdown the database

SQL> exit
$ srvctl stop database -d gcprod

Step 5: Mount the database

$ echo $ORACLE_SID
gcprod1

$ sqlplus "sys as sysdba"
SQL> startup mount
ORACLE instance started
Total System Global Area: 4.4678E+10 bytes
Fixed Size 2166864 bytes
Variable Size 4345302960 bytes
Database Buffers 4.0316E+10 bytes
Redo Buffers 14606336 bytes
Database mounted.

Step 6: Enable Archive log

SQL> alter database archivelog;

Step 7: Enable the cluster

SQL> alter system set CLUSTER_DATABASE=TRUE scope=spfile;
system altered

Step 8: Shutdown the instance

SQL> shutdown immediate;

Step 9: Start all the instances

$ srvctl start database -d gcprod

Step 10: verify the status.

$ crs_stat -t
all instances must be online

$ sqlplus "sys as sysdba"
SQL> archive log list
Database log mode Archive Mode
Automatic archival Enabled
Archive destination USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence 308
Next log sequence to archive 309
Current log sequence 309

Change VIP address

You need to enter the Virtual IP and Virtual host name during a clusterware installation. These information are stored in the OCR and different components within RAC depends on these VIPs.
If for any reason you want to change the VIP, you may do it using ifconfig and srvctl utilities.
The following steps are performed to change the VIP address.

Step 1: Confirm the current IP address for the VIP

$ ifconfig - a

Step 2: Stop all the resources that are dependent on the VIP on that particular node.

$ srvctl stop instance -d DB -i db1
$ srvctl stop asm -n node1
$ su - root

# srvctl stop nodeapps -n node1

Step 3: Verify that VIP is no longer running.

$ ifconfig -a

The output must be blank. If any interface is listed, it means there are components that is dependant on VIP is still running. Stop those resources.

Step 4: Change /etc/hosts file

Edit the /etc/hosts file with the new ip address and hostname.

Step 5: Modify the nodeapps and provide the new VIP address using srvctl.

$ su -root

# srvctl modify nodeapps -n node1 -A 192.168.4.41/255.255.255.0/eth0

where 192.168.4.41 is the new IP address and 255.255.255.0 is the subnet mask
and eth0 is the interface you want your VIP to use.

Step 6: Start the nodeapps again

# srvctl start nodeapps -n node1

Step 7: Repeat step 1 -6 on the other available nodes.

Step 8: Modify the IP address in the tnsnames.ora and listener.ora files.

Thanks