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IDS 11.10 - 30 Sep 2012
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IDS Forum

RE: RE: IDS 12.1- Query cost High

Posted By: Mike Walker
Date: Thursday, 7 April 2016, at 11:18 a.m.

In Response To: Re: RE: IDS 12.1- Query cost High (MOHD FADZIL JUSOH)

I'm confused - you said the same query plan is being used, yet then you say
that it's using an index on 11.10, but a sequential scan on 12.10. Which is
it?

For the estimated costs, I'm saying don't read too much into those numbers.
That is really only useful when comparing different query plans on the SAME
version of the server. Best to focus on the query plan shown and real world
timings (which I understand are slower on the new version).

About the repeated tests - have you run it twice in a row, without
restarting the engine in-between, and without changes to the index? Could
be that the pages are nicely cached on 11.10, but they haven't had a chance
yet to cache on 12.10.

-----Original Message-----
From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of MOHD
FADZIL JUSOH
Sent: Thursday, April 07, 2016 8:47 AM
To: ids@iiug.org
Subject: Re: RE: IDS 12.1- Query cost High [36921]

Hi,

same query plan is being used for both versions, yes.

Don't worry about the different estimated costs - as Art said that can be
misleading if using that to compare across engines.- I worry becouse this
syntax make our operation take long time to complete/produce report. Before
this only take 2 hour (running on ids 11.10) but after try run on ids 12,
finish after 6 hour.

Do you get the same results if you repeat the test? - yes, i repeat query
after drop & create again index (on ids 12.10), do update statistic
low,medium & high.

Could it be better caching on the 11 engine, vs the 12?-i try run on ids
12.10 for first time.
Do you have similar sized bufferpools on both versions? yes.

Are you using equivalent disks on both of these servers? - disk for ids
12.10 better that disk for ids 11.10.

Is there activity on the 12.10 server that may be causing locks, or
consuming resources? - no, only this process run on new ids 12.10.

I try to point back our problem, same query return higher query cost on ids
12.10, if u see my first posting, on ids 11.10 this query successfully
running using index patch, but on ids 12.10 it running using sequence scan,
why it return different result, any wrong with my exiting index? Any
parameter config on ids 12.10 need to enable to allow systax using index.

Thank you

****************************************************************************
***
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