How to Enable Archive Log Mode in Oracle

(Switch to ARCHIVELOG Mode)

If you want to disable archive log mode (switch to NOARCHIVELOG mode), follow these steps:

1. Check Current Archive Log Mode

Before making changes, check if your database is in NOARCHIVELOG mode:

command -> select log_mode from v$database;

The database in noarchivelog mode




 

If the output is NOARCHIVELOG, it means archive logging is disabled.

2. Shutdown the Database

You cannot switch to ARCHIVELOG mode while the database is running, so first shut it down:

commnd -> shut immediate;






3. Start the Database in MOUNT Mode

the database should be in mount stage to disable or enable it








4. Enable Archive Log Mode (Switch to ARCHIVELOG Mode)

Run the following command:

ALTER DATABASE ARCHIVELOG;







5. Open the Database Normally

ALTER DATABASE OPEN;







6. Verify the Change

Run this command again to confirm the mode:

SELECT log_mode FROM v$database;




Impact of Enabling Archive Log Mode

✅ Point-in-Time Recovery: With archive logs, you can restore the database to any point in time. 
✅ Better Disaster Recovery: Archive logs ensure minimal data loss in case of a failure. 
✅ Essential for High Availability: Required for Data Guard, Replication, and Standby Databases. 
✅ Increased Storage Usage: Archive logs consume additional disk space, requiring proper management. 
✅ Performance Considerations: Continuous writing of archive logs may impact performance slightly, but benefits outweigh this in production systems.

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