RE: RMAN backups

  • From: "Ruth Gramolini" <rgramolini@xxxxxxxxxxxxxxx>
  • To: <jrsmiley@xxxxxxxxx>, <richard.ignizio@xxxxxxxxxx>
  • Date: Tue, 21 Jun 2005 13:05:00 -0400

John,

Unless something has changed with 10g, and incremental backup doesn't
actually save much time.  Rman still has to read the block headers to see if
the block needs to be backed up.  It mostly saves space on disc if backing
up to disk.

Correct me if I am wrong!
Ruth
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx]On
Behalf Of John Smiley
Sent: Saturday, June 18, 2005 11:19 AM
To: richard.ignizio@xxxxxxxxxx
Cc: oracle-l@xxxxxxxxxxxxx
Subject: Re: RMAN backups


Backup times with RMAN are going to vary greatly depending upon the hardware
and how many blocks need to be backed up.  Even a very large database can be
backed up incrementally if very few blocks have changed since the last
backup with RMAN.

What might be a better yardstick is backup rate.  The fastest RMAN backup
rate I've seen was published by Amazon a few years back.  They attained 2TB
/ hour.

John Smiley
Technical Management Consultant
TUSC, Inc.

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