Re: I almost dropped the system due to SQL using large amounts forresources -- MIDRANGE-L

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At 10:46 2008-05-30 -0400, Tim Gornall wrote:

We have a SQLRPGLE program that dynamically builds the SQL
statement based on user imput. Sometimes the statement can
fairly large and when it is it uses very large amounts of
both processing and storage resources. I have seen it
gobble up processer, but was surprised yesterday when I
noticed the the system ASP when through the roof. The ASP
was up to 93 percent and climbing when I got word. As soon
as I ended the job the ASP came back down almost
immediately. I backed out the process completely until I
can be assured this won't happen again.

I have seen (okay, I confess: made <grin />) such blow-ups
only from a wrong or missing join condition. Take a look at
the statement that the program built.

I suppose it is possible the query engine would create an
enormous intermediate result on its way to a reasonable
final result, but I do not remember ever seeing such a
thing. If this seems to be happening to you, you may need
to reword the query. There are tools on the system, and
this list will help, too.

Cheers,
Terry,
rent-a-geek and database-bithead.

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