RMAN 10gR2 Tape vs Disk Backup Performance When Database is 99% Empty

(Doc ID 428344.1)

Last updated on OCTOBER 12, 2016

Applies to:

Oracle Server - 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"



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