My Oracle Support Banner

RMAN 10gR2 Tape vs Disk Backup Performance When Database is 99% Empty (Doc ID 428344.1)

Last updated on NOVEMBER 23, 2019

Applies to:

Oracle Database - Enterprise Edition - Version and later
Information in this document applies to any platform.


Full database backup is running extremely slowly: rate of transfer to tape is approximately
If they take a single large 100Gb tablespaceand issue backup validate to tape and then to disk
then the following times are noted:

backup validate to tape: 601 secs
backup validate to disk: 5 secs

Using RMAN debug trace we can see for disk backups:

"krbbnbf - Using Unused Block Compression algorithm to speed up backup"

And for tape backups:

"krbbSetOutputDevice: Unused Block Compression disabled due to channel type"



To view full details, sign in with your My Oracle Support account.

Don't have a My Oracle Support account? Click to get started!

In this Document

My Oracle Support provides customers with access to over a million knowledge articles and a vibrant support community of peers and Oracle experts.