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IDS Forum

Re: Update statistics issue

Posted By: Art Kagel
Date: Friday, 27 June 2014, at 11:39 a.m.

In Response To: Re: Update statistics issue (medkba)

There are two AUS tasks, the AUS evaluator that determines what tables need
their stats updated and the AUS refresh task that executes the commands
calculated by the evaluator. You can find the task manager records
governing their execution in the sysadmin database in the table ph_task.
Run:

select tk_id, tk_name, tk_enable, tk_next_execution
from sysadmin:ph_task
where tk_execute matches 'aus*';

If tk_enable is set to 't' then the AUS tasks are running. Obviously if
the evaluator is executing but the refresh is not, then stats are not being
updated by AUS and if the refresh is running without the evaluator running
before it then the list of work its doing is probably out-of-date and may
even be empty. The tk_next_execution column will tell you when each is
scheduled to run next. Note that in 11.50 the evaluator was rather
inefficient and could take longer to run than the default difference in the
scheduled run times of the two tasks (1 hour) so that when the refresh
launched the evaluator may not have finished running resulting in the
refresh only processing some of the tables that needed to updated. This
was fixed in 11.70 and again in 12.10 by recoding the evaluator to run
faster and by changing the default scheduling of the tasks so they run
further apart.

Art

Art S. Kagel, Principal Consultant
ASK Database Management

Blog: http://informix-myview.blogspot.com/

Disclaimer: Please keep in mind that my own opinions are my own opinions
and do not reflect on the IIUG, nor any other organization with which I am
associated either explicitly, implicitly, or by inference. Neither do
those opinions reflect those of other individuals affiliated with any
entity with which I am affiliated nor those of the entities themselves.

On Fri, Jun 27, 2014 at 10:05 AM, medkba <medkba@gmail.com> wrote:

> Yes, i have running update statistics one of the database i.e. most used
> the application
> Run UPDATE STATISTICS LOW
> Ok, i will read this article
> Dosstat runs weekly once
> This is new hp blade server with 32gb memory. It means that hardware very
> powerful but statistics job running slow then the question aries why slow
> and hard to convenience management to change different way of running.
> How do i check aus running
> Thank you
> On 27 Jun 2014 21:18, "Art Kagel" <art.kagel@gmail.com> wrote:
>
> > "from a shell script" wasn't what I was looking for. Are you running plan
> > UPDATE STATISTICS? UPDATE STATISTICS LOW? UPDATE STATISTICS MEDIUM?
> > UPDATE STATISTICS HIGH? Combinations of multiple commands? Are you
> > running these in dbaccess? If so are you running against just this one
> > table in each command or against the entire database? Are you using my
> > dostats utility to generate an optimal set of commands?
> >
> > OK, first thing to do then is to read John's paper. Link here:
> >
> >
> >
> >
>
> http://www.ibm.com/developerworks/data/zones/informix/library/techarticle/miller/0203miller.html#section3
> >
> > Quick-and-dirty:
> >
> > export PDQPRIORITY=100 # Or as high as you dare without disrupting
> > production resource requirements.
> > export PSORT_NPROCS=16 # I know the max documented is 10, trust me.
> > Make sure that you have lots of memory allocated to DS_TOTAL_MEMORY to
> > allow for all sorting to be accomplished in memory. If you want to know
> how
> > much memory you will need and you haven't zero'd out your server stats
> > since the last time you tried running the update statistics (ie onstat
> -z)
> > then the sysmaster:sysprofile table has a row containing the size of the
> > largest sort that's been executed in KB:
> >
> > select value from sysmaster:sysprofile where name = 'maxsortspace';
> >
> > I think that I remember that you are using 11.50 so you can't take
> > advantage or LOW sampling.
> >
> > BTW, in another reply you said you are only runing vanilla UPDATE
> > STATISTICS with no modifiers. This command does not update the data
> > distributions for the table, it only updates a few columns in systables,
> > syscolumns, sysfragments, and sysindices/sysindexes like nrows and npused
> > in systables, colmin and colmax in syscolumns, nlevels, nleaves, uniq,
> > clust, and nrows in sysindices. You need to run a combination of LOW,
> > MEDIUM, and HIGH on individual sets of columns to get really useful data
> > distributions in minimum time. If you use my dostats utility, as do
> > hundreds of Informix sites, it will take care of that for you.
> >
> > BTW, have you disabled Auto Update Statistics (AUS)? Because if not then
> > AUS is running every night updating stats for you (almost as well as
> > dostats would) so you should not have to be running update statistics
> > manually (or from cron) anyway.
> >
> > Art
> >
> > Art S. Kagel, Principal Consultant
> > ASK Database Management
> >
> > Blog: http://informix-myview.blogspot.com/
> >
> > Disclaimer: Please keep in mind that my own opinions are my own opinions
> > and do not reflect on the IIUG, nor any other organization with which I
> am
> > associated either explicitly, implicitly, or by inference. Neither do
> > those opinions reflect those of other individuals affiliated with any
> > entity with which I am affiliated nor those of the entities themselves.
> >
> > On Fri, Jun 27, 2014 at 8:48 AM, medkba <medkba@gmail.com> wrote:
> >
> > > Running from cron jobs daily from shell script
> > > Not using PDQPRIORITY
> > > 23 CPUs
> > > 8 cpu vps is used increased from 6 to 8 no improvement
> > >
> > > Please let me if require more information
> > >
> > > Thank you very much
> > > On 27 Jun 2014 19:43, "Art Kagel" <art.kagel@gmail.com> wrote:
> > >
> > > > How are you running update statistics for that table? What
> environment
> > > > variables have you set? Are you using PDQPRIORITY? What engine
> version
> > > > and edition are you using? How many cores are on the machine and how
> > many
> > > > CPU VPs are configured?
> > > >
> > > > Have you read John Miller's paper in optimizing update statistics
> runs?
> > > >
> > > > Art
> > > >
> > > > Art S. Kagel, Principal Consultant
> > > > ASK Database Management
> > > >
> > > > Blog: http://informix-myview.blogspot.com/
> > > >
> > > > Disclaimer: Please keep in mind that my own opinions are my own
> > opinions
> > > > and do not reflect on the IIUG, nor any other organization with
> which I
> > > am
> > > > associated either explicitly, implicitly, or by inference. Neither do
> > > > those opinions reflect those of other individuals affiliated with any
> > > > entity with which I am affiliated nor those of the entities
> themselves.
> > > >
> > > > On Fri, Jun 27, 2014 at 3:30 AM, medkba <medkba@gmail.com> wrote:
> > > >
> > > > > Hi All,
> > > > >
> > > > > I am having one table and contains data 23326189 and taking about
> 15
> > > mins
> > > > > to complete update statistics
> > > > >
> > > > > Is there any opportunities to minimize this time?
> > > > >
> > > > > thank you very much
> > > > >
> > > > > --001a11c35338ab010704fccc4622
> > > > >
> > > > >
> > > > >
> > > > >
> > > >
> > > >
> > >
> > >
> >
> >
>
> *******************************************************************************
> > > > > Forum Note: Use "Reply" to post a response in the discussion forum.
> > > > >
> > > > >
> > > >
> > > > --001a11c3eaaa3f037b04fccfcec4
> > > >
> > > >
> > > >
> > > >
> > >
> > >
> >
> >
>
> *******************************************************************************
> > > > Forum Note: Use "Reply" to post a response in the discussion forum.
> > > >
> > > >
> > >
> > > --089e0158b87c65336e04fcd0b829
> > >
> > >
> > >
> > >
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> *******************************************************************************
> > > Forum Note: Use "Reply" to post a response in the discussion forum.
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> > --089e01182b54c5879104fcd123c5
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> > Forum Note: Use "Reply" to post a response in the discussion forum.
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> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
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