RMAN Full Database Backup Takes 6 Times Longer Than Expected (Doc ID 2856405.1)

Last updated on JULY 20, 2024

Applies to:

Symptoms

RMAN backup to disk through the following command takes 2 days to complete:
backup as backupset incremental level 0 section size 32g database plus archivelog section size 32g DELETE ALL INPUT;

While on another server with same OS and RDBMS version and similar hardwares (even less CPUs), 
RMAN backup takes 6 hours to complete. 

Part of sample script:

Adding the VALIDATE option to the RMAN command according to note RMAN Performance Troubleshooting (Doc ID 1326686.1),
and with 4 disk channels allocated makes not much difference in performance.

Changes

Cause

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