Re: db file scattered reads

  • From: Tim Gorman <tim@xxxxxxxxx>
  • To: lyallbarbour@xxxxxxxxxxxxxxx
  • Date: Wed, 01 Dec 2010 14:00:03 -0700

Lyall,

Regarding your comment that this is a "off-the-shelf application that you can't touch":  adding custom-built indexes generally does not violate support for 3rd-party off-the-shelf applications.  The main requirement is usually that you build them in such a way that they are easily identifiable, easily dropped and re-created, and not created so as to disrupt product patching, etc.  I'm sure lots of folks on this list have lots of advice on this, covering a wide variety of COTS apps.  Perhaps someone on this list is managing the same application as well?

Please verify with your application vendor on their policies for support for custom-built indexes?

Hope this helps...
Tim Gorman
consultant -> Evergreen Database Technologies, Inc.
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website    => http://www.EvDBT.com/
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Lost Data? => http://www.ora600.be/ for info about DUDE...

On 12/1/2010 1:04 PM, lyallbarbour@xxxxxxxxxxxxxxx wrote:
Hello everyone,
  From what i understand in my reading of this wait event, it happens the most with Fast Full Table Scans.  As we all know, FFTS's aren't necessarily a bad thing.  Looking through ADDM's and ASH reports from one of our databases, db file scattered reads on one table is the main culprit for the bottlenecks on this system.  This is an off the self application that i can't touch, so the only SQL tuning i can do is with SQL Profiles.  Is there anything i can do under the scenes to release some of this bottleneck?  Move the table into it's own tablespace?  Change the storage settings?  That's one thing i can't find through google, is what to do if you get db file scattered reads.  I'm still waiting for my tuning guide from Rampant, it's on backorder...

Thanks,
Lyall


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