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IDS Forum

RE: Performance Issue w/View

Posted By: Vaibhav S Dantale
Date: Wednesday, 16 February 2011, at 11:26 p.m.

In Response To: RE: Performance Issue w/View (Dan Mueller)

What's the PMR number ?
Regards,
Vaibhav S Dantale
___________________________________________________________
If you think you can't do, you can't. If you think you can do, still you
are right
Competitive Technology Enablement, Informix Dynamic Server
Information Management
Address:
IBM India Software Labs,
Cell: +91-9503161335
Email: vdantale@in.ibm.com
My Blue page
Informix Competitive Wiki (IBM Internal)

"Dan Mueller" <Dan.Mueller@trnswrks.com>
Sent by: ids-bounces@iiug.org
02/16/2011 09:41 PM
Please respond to
ids@iiug.org

To
ids@iiug.org
cc

Subject
RE: Performance Issue w/View [22804]

I just did it for support and it is pretty large. I would be happy to
email
the output if you want to provide your address but I don't think I should
clutter up the forum???

Dan

-----Original Message-----
From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of
Fernando
Nunes
Sent: Wednesday, February 16, 2011 10:42 AM
To: ids@iiug.org
Subject: Re: Performance Issue w/View [22803]

Ups... I already understood the issue. I was referring to the SQL SET
EXPLAIN
output :) Can you run the queries in the several situations with SET
EXPLAIN
ON and post here the query plans (if these isn't too big/complex).
Regards.

On Wed, Feb 16, 2011 at 3:19 PM, Dan Mueller
<Dan.Mueller@trnswrks.com>wrote:

> I will certainly try to explain in as few words as possible (-;
>
> 1. I have a view that points to a single table that has 460 million
> rows fragmented by quarters back to 2007. The majority of these
> fragments are in the same dbspace.
> 2. I have created separate tables for each year's worth of data and
> fragmented each of those tables by quarter in separate dbspaces. The
> indexes are also fragmented the same way but live in separate dbspaces
> than their associated data.
> 3. I can select count(*) from the old single table view with great
> performance. Takes indexed path.
> 4. I can select count(*) from the multiple new tables using a union or
> a union all with great performance. Takes indexes path.
> 5. A select count(*) from the new multi table view will run until it
> uses all of it's sort space and dies. I don't have the errors handy
> but can repro in about an hour. It does take sequential paths on both
> tables in the view at this point.
> 6. Adding an index directive to the multi table view allows it to
> finish but takes over ab hour to do so. It now takes indexed paths to
> the data using the directives.
>
> Hope this makes it understandable.
>
> Thanx,
> Dan
>
> -----Original Message-----
> From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of
> Fernando Nunes
> Sent: Wednesday, February 16, 2011 9:58 AM
> To: ids@iiug.org
> Subject: Re: Performance Issue w/View [22801]
>
> For our "education" could you post the explains of the various
situations?
> Unless they're too big or complex... in that case maybe it's better to
> wait for tech support.
> Regards.
>
> On Wed, Feb 16, 2011 at 2:55 PM, DAN MUELLER <dan.mueller@trnswrks.com
> >wrote:
>
> > UPDATE
> >
> > I enabled IFX_FOLDVIEW - no help. I changed my union to union all -
> > no help. I added an index directive to a uniquely indexed serial
> > column, a little help but still sux.
> >
> > I have opened a PMR.
> >
> > Bottom line on this one is:
> >
> > view to one table - great performance.
> > query to multiple tables w/union and union all - great performance.
> > view to same tables as above - sux.
> >
> > I am willing to try what comes my way on this one so if there are
> > any additional items, please reply.
> >
> > thanx,
> > dan
> >
> >
> >
> >
>
>
>

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

> > Forum Note: Use "Reply" to post a response in the discussion forum.
> >
> >
>
> --
> Fernando Nunes
> Portugal
>
> http://informix-technology.blogspot.com
> My email works... but I don't check it frequently...
>
> --000e0cd6d29c3723f6049c67829c
>
>
>
>

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

> Forum Note: Use "Reply" to post a response in the discussion forum.
>
>
>
>

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

> Forum Note: Use "Reply" to post a response in the discussion forum.
>
>

--
Fernando Nunes
Portugal

http://informix-technology.blogspot.com
My email works... but I don't check it frequently...

--0015174c1038960659049c681f62

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

Forum Note: Use "Reply" to post a response in the discussion forum.

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

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