Re: RMAN Performance Maladies
- From: Job Miller <jobmiller@xxxxxxxxx>
- To: oracledba.williams@xxxxxxxxx, MFontana@xxxxxxxxx
- Date: Mon, 12 Feb 2007 18:16:07 -0800 (PST)
an SLA that says you need a full backup? That's not an SLA/requirement it is a
technical implementation specification.?
SLA should read, full recovery of all committed data within x minutes right?
Whoever wrote the SLA should rethink it. 10.2 also has incremental merges so
you still have a "full backup on disk", despite not having taken a full backup
everyday.
but the SLA author may be against that. Did the SLA mandate the RMAN script
as well? :)
seriously though. you can limit the read/write rate for RMAN, that wouldn't
help your cause. RMAN also tracks the disk read/write rates in some of its
views. It has been awhlie now that I looked at that stuff, but it was there..
reports on how much throughput you got for each piece it backed up.
RAID 5 a "compromise" between efficiency and performance? That sounds like
the "compromise" the native americans made with the settlers.
Job
Dennis Williams <oracledba.williams@xxxxxxxxx> wrote:
Michael,
Backing up to RAID 5? Well expect that to be a little sluggish. Also, RMAN
doesn't just blast the files to disk, it is doing more complicated stuff.
Meaning more writes, which again RAID-5 does slowly.
Dennis Williams
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