🔧 Prerequisites:
Source and target systems must have the same OS and Oracle versions.
Sufficient storage and network bandwidth.
Oracle Clusterware configured on both systems.
Backup strategy in place.
Step 1: Pre-Migration Assessment
Gather Environment Details:
Check Oracle version (v$version).
Verify RAC setup with crsctl commands.
Ensure both environments meet hardware/software prerequisites.
Capacity Planning:
Validate target system resources (CPU, memory, storage).
Check ASM disk group sizes for sufficient space.
Network Configuration:
Ensure interconnect and public IPs are configured.
Update /etc/hosts or DNS for hostname resolution.
Step 2: Prepare Target Environment
Install Oracle Software:
Use Oracle Universal Installer (OUI) to install the same Oracle version as the source.
Set Up Clusterware:
Configure Oracle Grid Infrastructure.
Verify with crsctl check cluster.
Create ASM Disk Groups:
Use asmca or SQL commands to create required disk groups (e.g., DATA, FRA).
Step 3: Backup Source Database
Backup Options:
Use RMAN for a full database backup:
RMAN> BACKUP DATABASE PLUS ARCHIVELOG;
Transfer Backup to Target:
Use scp or any file transfer tool to move backups to the target server.
Export Configuration:
Backup spfile, password file, and tnsnames.ora.
Step 4: Restore Database on Target
Copy Files:
Move RMAN backups, spfile, and password files to the target server.
Restore Control File:
RMAN> RESTORE CONTROLFILE FROM ‘/path/to/controlfile_backup’;
Mount Database:
RMAN> ALTER DATABASE MOUNT;
Restore Database:
RMAN> RESTORE DATABASE;
RMAN> RECOVER DATABASE;
Step 5: Configure RAC
Add Instances to Cluster:
Use srvctl commands:
srvctl add instance -d -i -n
Verify RAC Configuration:
Check instance status:
srvctl status database -d
Update Listener and TNS:
Configure listener.ora and tnsnames.ora for client connectivity.
Step 6: Post-Migration Validation
Validate Application Connectivity:
Test connections using sqlplus or client tools.
Verify Performance:
Monitor database using AWR, ADDM, and OEM.
Enable Backups:
Schedule RMAN backups on the new system.
💡 Pro Tip: Always test your migration process in a staging environment before moving to production to minimize risks.