RE: consistent gets

From: Steve Adams <steve.adams_at_ixora.com.au>
Date: Tue, 7 Nov 2000 07:32:04 +1000
Message-Id: <10672.121242@fatcity.com>

Hi Dick,

I think you are confusing 'consistent changes' with 'consistent gets'. Lot's of 'consistent gets' with a lot of 'physical reads' is just a good cache hit rate.

@   Regards,
@   Steve Adams
@   http://www.ixora.com.au/
@   http://www.christianity.net.au/

-----Original Message-----

From: dgoulet_at_vicr.com [mailto:dgoulet_at_vicr.com] Sent: Tuesday, 7 November 2000 1:01
To: Multiple recipients of list ORACLE-L Subject: Re:consistent gets

Lots of consistent gets without a lot of disk reads would indicate a query that is running against a table that is undergoing lots of change at the same time. Your basically dealing with a situation where Oracle is applying rollback information to the table to reproduce a consistent view of the data from the point where the query started.

Dick Goulet

____________________Reply Separator____________________
Author: nlzanen1_at_ey.nl
Date:       11/6/00 6:10 AM

Hi All,

I have an I/O bound sytem here.

One querry that gets executed many times per day has a lot of consistent gets (17000)
I can easily change this to a much lower value (13) but it seems to make the querry slower (?)
This Querry does not have disk reads

What is exactly consistent gets (??)
Does this affect the I/O in a big way or not (no disk reads would suggest no difference)

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