RE: Restricting QZDASOINIT jobs

Sorry, yes I meant to thank Paul for the helpful info. The problem is I can't change the priority of the jobs are they are a mix of user interactive screens and informational displays. One of my colleagues pointed me to a document by IBM on changing the prestart jobs of QZDASOINIT jobs from the default 200 to one. It also mentions ensuring the maximum number of jobs is set to *NOMAX.

And yes, I meant we created indexes based on the index advisor.

In looking at the jobs themselves I see a repeated warning about a correlation without qualification occurring for a specific column. I'm guessing this is also a contributing factor as well, so I have charged the .NET programmer with tracking down this rogue SQL statement and rectifying the issue.

Thanks!

/b;

-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Charles Wilt
Sent: Friday, July 15, 2016 11:21 AM
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxx>
Subject: Re: Restricting QZDASOINIT jobs

Brian,

Paul offered some good advice. QZDASOINIT jobs by default have a run priority of 20, which is the same as a 5250 interactive job.

That makes sense if the ODBC jobs are for client/server interactive apps.

If not, then the priority probably should be lowered.

Run priority is a key component of management, but not the only. Assuming you don't have the expertise in-house. It might be worthwhile to pay for someone to take a look at make some recommendations.

Not sure what "optimising SQL statements" means, but if it didn't include looking at the recommended indexes and creating some of them. Then you need to do that.

If you know which statements are a problem, focus on those.

Otherwise, go into iNav or NavI and clear all advised indexes. Now run for a few days or a week and go back in and see what's advised.

The only way to make an SQL statement do less work, is to change what you need (ie. 6 months instead of 12 months) or provide the indexes it needs to accomplish what you want efficiently.

Charles



On Fri, Jul 15, 2016 at 7:01 AM, Brian Piotrowski < bpiotrowski@xxxxxxxxxxxxxxx> wrote:

Thanks, Charles.

It's not that I want to see QZDASOINIT jobs at less than x% - it's
because they are having a bona fide impact on the system. We've been
struggling with this forever - we can optimize the sql statements
until the cows come home but it doesn't seem to make a difference -
QZDASOINIT jobs consume a significant amount of CPU cycles.

We're actually going to move to a different ODBC driver from a third
party to see if that solves the problem. But in the meantime I'll
read over the documentation you included and we'll see if it makes sense to implement.

Thanks!

-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of
Charles Wilt
Sent: Thursday, July 14, 2016 4:30 PM
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxx>
Subject: Re: Restricting QZDASOINIT jobs

At 7.1+ you can assign "workload groups"

https://www.ibm.com/developerworks/community/wikis/home?lang=en#!/wiki
/IBM%20i%20Technology%20Updates/page/IBM%20i%20workload%20groups

But only useful if you're running a multiple core machine.

Why do you want to do this?

Assuming your CPU isn't at 100%, all you'd be doing is artificially
slowing down the work being done via ODBC. It won't speed up anything else.

Do you actually have a problem? Or do you just not like seeing
QZDASOINIT using 50%?

If you actually have a problem, you can adjust run priority, memory
available, max active, ect ect to provide more resources for non-ODBC work.

Charles


On Thu, Jul 14, 2016 at 3:59 PM, Brian Piotrowski <
bpiotrowski@xxxxxxxxxxxxxxx> wrote:

Hi all,

A while ago I moved all of my ODBC spawned jobs into their own
subsystem (which I conveniently named "ODBC"). Is there a way I can
restrict how many resources they consume? Whenever I look at my
system status the QZDASOINIT jobs seem to hog a lot of resources (in
excess of 50% CPU utilization). I'd like to restrict them to using
a cumulative percentage of less than 25%, but not sure if it can be done.

Thankee-sai!

/b;

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