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IDS Forum

RE: Performance Issue w/View

Posted By: Dan Mueller
Date: Tuesday, 15 February 2011, at 11:24 a.m.

In Response To: Re: Performance Issue w/View (Fernando Nunes)

Tried that - see my last post from this morning

-----Original Message-----
From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of Fernando Nunes
Sent: Tuesday, February 15, 2011 11:22 AM
To: ids@iiug.org
Subject: Re: Performance Issue w/View [22783]

Have you read the notes suggesting to create the view with "UNION ALL"
instead of "UNION" or am I missing something?
UNION will try to eliminate duplicate records. That means a large sort and that's because you run out of temp space.
Regards.

On Tue, Feb 15, 2011 at 2:23 PM, DAN MUELLER <dan.mueller@trnswrks.com>wrote:

> Okay, I now have IFX_FOLDVIEW set to 1 with the engine recycled. I
> have executed the query three ways now and still have my issue with
> the view pointing to multiple tables. I am also now using 'union all'.
>
> 1. If I execute the statement 'select count(*) from table1 union all
> select
> count(*) from table 2', an indexed path is taken on both tables and
> the results are shown instantaneously.
>
> 2. If I execute the following statement 'select count(*) from myview',
> a sequential scan is used in both tables in the view and the query
> eventually runs out of temp space. The actual view looks like 'create
> view myview (column
> list) as
> select (same column list) from table1
>
> x0 union all select (same column list)
>
> from table2 x1 ; '
>
> 3. Coincidently, if I execute the query 'select count(*) from anotherview'
> where anotherview is a view pointing only to the original giant table,
> indexed paths are taken and the results are also instantaneous.
>
> So my problem occurs when I have a view that is pointing to more than
> one large table. I guess here is where I would have to ask myself why
> am I bothering to even do this but there is good reason so I really
> need to get somewhere.
>
> 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...

--000e0cd6d29cdc4281049c5490e8

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