Re: compressed backup - is this a reasonable size

  • From: Robert Freeman <robertgfreeman@xxxxxxxxx>
  • To: JBECKSTROM@xxxxxxxxx, oracle-l-freelists <oracle-l@xxxxxxxxxxxxx>, oracle-db-l <oracle-db-l@xxxxxxxxxxxxxxxxxxxx>
  • Date: Wed, 22 Apr 2009 07:48:01 -0700 (PDT)

Very reasonable. Compression can do wonders for the size of backup sets! It can 
also significantly improve overall backup times. What were your times for the 
backup compressed and non-compressed and how much of a difference in CPU did 
they make.

Be aware that someone on here mentioned a bug with compression just a few days 
ago.I looked in Metalink for compression related bugs and found a few. In a 
very quick looksee I find most the bugs seem to be related to backups as 
opposed to restores. So it seems if you can get a good backup, then you might 
well be ok. As always, test test test, your restores. No piece of software is 
perfect! :-) On a regular basis continue to test your restores just in case a 
bug creeps in. My personal experience with Compression has been very positive.


 Robert G. Freeman
OCP: Oracle Database 11g Administrator Certified Professional Study Guide 
Oracle Database 11g New Features (Oracle Press)
Portable DBA: Oracle  (Oracle Press)
Oracle Database 10g New Features (Oracle Press)
Oracle9i RMAN Backup and Recovery (Oracle Press)
Oracle9i New Features (Oracle Press)
Other various titles out of print now...
The LDS Church is looking for DBA's. You do have to be a Church member in
good standing. A lot of kind people write me, concerned I may be breaking
the law by saying you have to be a Church member. It's legal I promise! :-)

From: Jeffrey Beckstrom <JBECKSTROM@xxxxxxxxx>
To: oracle-l-freelists <oracle-l@xxxxxxxxxxxxx>; oracle-db-l 
Sent: Wednesday, April 22, 2009 7:36:52 AM
Subject: compressed backup - is this a reasonable size

Just ran the following command.  This is our first RMAN backup.  It backed up a 
17G database into about 3G of files.  Is this reasonable?????
backup as compressed backupset database plus archivelog delete input;
Backup states it finished normally.
Jeffrey Beckstrom
Database Administrator
Greater Cleveland Regional Transit Authority
1240 W. 6th Street
Cleveland, Ohio 44113

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