RMAN impact on the source database

Owned by Michael Litner
Aug 06, 2024
1 min read

The impact of RMAN (Recovery Manager) backup on an Oracle database can vary, but it typically affects several key parameters: CPU utilization, disk I/O, memory usage and network bandwidth. Here are the impacts:

  1. CPU Utilization:

    • RMAN operations, particularly when using compression and encryption, can significantly increase CPU usage. Depending on the backup strategy and the number of RMAN channels used, CPU utilization can rise by 5% to 30% during backup processes​​​​.

  2. Disk I/O:

    • Disk I/O is impacted by RMAN backups due to read and write operations involved. This can result in a 10% to 50% increase in disk I/O, especially when performing full backups. Incremental backups tend to have a lower impact compared to full backups​​​​.

  3. Memory Usage:

    • Memory usage during RMAN backups typically sees a 2% to 10% increase. This is due to the allocation of memory buffers and the use of RMAN channels which require additional memory resources​​​​.

  4. Network Bandwidth:

    • When backing up to a remote location, network bandwidth usage can increase by 5% to 40%. The impact is influenced by the number of RMAN channels used and the available network bandwidth​​​​.