Re: rpg sql timeout question -- RPG400-L

Rob's link gives the reasons IBM doesn't provide a true time-out.

The ability of the governor to predict and stop queries before they
are started is important because:

* Operating a long-running query and abnormally ending the query
before obtaining any results wastes system resources.
* Some CQE operations within a query cannot be interrupted by the
End Request (ENDRQS) CL command. The creation of a temporary index or
a query using a column function without a GROUP BY clause are two
examples of these types of queries. It is important to not start these
operations if they will take longer than the user wants to wait.

HTH,
Charles

On Tue, Mar 3, 2009 at 10:18 AM, <rob@xxxxxxxxx> wrote:

http://publib.boulder.ibm.com/infocenter/systems/scope/i5os/topic/rzajq/cqa.htm?tocNode=%74%6f%63%3a%72%7a%61%68%67%2f%69%35%6f%73%2f%34%2f%35%2f%35%2f%31%32%2f&searchQuery=%71%61%71%71%69%6e%69&searchRank=%31&pageDepth=%34

Rob Berendt
--
Group Dekko Services, LLC
Dept 01.073
Dock 108
6928N 400E
Kendallville, IN 46755
http://www.dekko.com

From:
"tim" <tim2006@xxxxxxxxxxx>
To:
"'RPG programming on the IBM i / System i'" <rpg400-l@xxxxxxxxxxxx>
Date:
03/02/2009 07:02 PM
Subject:
RE: rpg sql timeout question
Sent by:
rpg400-l-bounces@xxxxxxxxxxxx

Tom,

Its possible that a query such as "select * from customer where custname
like %a_b%" is possible. The file has close to 1 million records. I was
wondering if I could put a time limit on the execution of the query. So,
say
after 30 seconds the query stops querying and returns a time allotted has
expired or something like that.

I am using service calls to my iseries. These jobs are running in batch.

-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx [mailto:rpg400-l-bounces@xxxxxxxxxxxx]
On Behalf Of Armbruster, Tom
Sent: Monday, March 02, 2009 5:45 PM
To: RPG programming on the IBM i / System i
Subject: RE: rpg sql timeout question

Good question, but a dangerous one at the same time. For what reason
would you want to time out a request to the database? There are only a
few reasons that SQL requests would time out:

1) CPU utilization is too high.
2) The query is written for updates on locked records.
3) The query is processing a large amount of data without the necessary
resources.
4) The query is not optimized.

Before concerning yourself with timeouts in native RPG, you may want to
ensure that you have optimized the data access methods. Running SQL
interactively can be a slow process if the files and the query
statements are not optimized. If the queries do not need to run
interactively, consider pushing them to a batch process. If interactive
is required, optimize the queries as much as possible.

What is the situation you are referring to for which you want to
consider time outs?

Tom Armbruster

-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of tim
Sent: Monday, March 02, 2009 11:57 AM
To: 'RPG programming on the IBM i / System i'
Subject: rpg sql timeout question

Is there a way to have a possibly long running sql performed in an
SQLRPGLE
program, to time out after running for a certain amount of time?

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