Re: high db hit ratio and a lot of waits on db sequential reads
- From: fmhabash <fmhabash@xxxxxxxxx>
- To: Mark.Bobak@xxxxxxxxxxxxxxx
- Date: Wed, 26 Sep 2007 12:12:20 -0400
For my edification, can you please provide these metrics ...
- LIO/sec
- PIO/sec
- if you look at your sql ordered by PIO, what do you see there. Can you
tell from the code what tables are being read from disk and why?
Also, on a finely tuned DB and in the absence of any other significant
wait events (e.g. log sync, scattered ...., etc), why wouldn't you
expect to see DBFSR as the top one. After all ,that's what the DB should
be doing serving user requests. The question, then, becomes how costly
it is. If you are doing less than 20ms, then you have no reason to loose
sleep over it (not that you are).
Thank you
Fred Habash, Lead Oracle DBA (OCP 8i,9i)
Oracle Team Portal http://spc-00sv0d03e3.spc.supc.com/ddcports/oracle/
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