RE: Tuning RMAN backup and recovery

That has not been my finding with 10.2.0.2 on AIX 5.3.

My backups to Netbackup (disk staging pool, not straight to tape) are actually *faster* with compression on. I'm backing up about 250GB worth of datafiles and without compression, the backup is only slightly smaller than the database itself and runs in about 4.5 hours, but with compression the backup only 36GB and completes in only 2.5 hours. I've seen this result consistently for a few months now after switching back and forth between compressed and non-compressed. I still have to do more testing to do on the restore side, but so far it looks like restores of the compressed backupsets may take signifcantly longer than restores of the non-compressed backupsets - maybe twice as long.

-----Original Message-----
From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Limin Guo

I guess that it is a known issue of compression performance with RMAN in 10.1 and 10.2.

When compression is enabled (no parallelism), RMAN backup takes about 5 times longer

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