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IDS Forum

RE: Is PDQ only for DSS?

Posted By:
Date: Sunday, 15 October 2017, at 1:32 p.m.

In Response To: Re: Is PDQ only for DSS? (Fernando Nunes)

I will agree with Fernando but add that there is one small pa= rt of

the PDQ which has been adapted to OLTP. This is the amoun= t of sort

memory an OLTP application can use, by default the amount of memo= ry

an OLTP application can use before doing a disk sort is very small (I

th= ink it is 256KB). You can use DS_NONPDQ_QUERY_MEM to increase the

upp= er bound on sort memory of SQL operations which have a PDQ of 0.

If y= ou have plenty of memory I would start at a couple of MB.

There= are sysmaster tables which you can monitor to see how this is

tuning is he= lping you.

John Miller



=0A------= -- Original Message --------

=0ASubject: Re: Is PDQ only for DSS? [4007= 5]

=0AFrom: "Fernando Nunes" <[1]>

=0ADate: Fri, October 13, 2017 4:34 pm=0ATo: [2]


=0AHi, =


=0AAn OLTP workload hardly takes advantage of PDQ. But many OLTP=


=0Aalso have DSS like processes, so let's assume we don't li= ve in a

black and

=0Awhite world... There are many shades of grey (the = color, not the



=0AIf you need to do some maintenance= work PDQ can also help. But if


=0Aconsider activating PDQ for a= n OLTP application, don't!


=0AThe way PDQ works, can have seriou= s impact on the system. The


=0Anotorious is that once the system d= ecides it will use PDQ, if

there are no

=0APDQ resources available, the= query will hang!. It will NOT

fallback to



=0ASo= ... if you're having performance issues on an OLTP instance,

and you just <= br>=0Anoticed the sentence "improve performance

dramatically", that's the w= rong





=0AOn Fri, Oct 13, 2017= at 5:09 PM, FLAVIO CARDOSO <[3]flavi=> wrote:


=0A> Hello all!!


=0A> IBM's docs says "Parallel database query (PDQ) is a database

serve= r feature

=0A> that can improve performance dramatically when the se= rver

processes queries

=0A> that decision-support applications initi= ate." (source:

=0A> [4] .70.

=0A> 0/".


= =0A> So, is PDQ only for DSS or can I use it for an OLTP instance as

wel= l?


=0A> Cheers!



=0A> ****= ********************************************************

=0A> ******= *************

=0A> Forum Note: Use "Reply" to post a response in the= discussion






=0AFernando= Nunes




=0AMy email w= orks... but I don't check it frequently...





= =0A Forum Note: Use "Reply" to post a response in the discussion

forum. =0A




1. 3D"

2. 3D""

3. 3D""

4. 3D"

5. 3D"http://informix-technology.=/

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