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IDS Forum

Re: Update statistics issue

Posted By: Art Kagel
Date: Monday, 30 June 2014, at 6:10 p.m.

In Response To: RE: Update statistics issue (LARRY SORENSEN)

Normally AUS does:

- LOW on the whole table

- High on leading index columns as described in the Performance Guide

- Medium on the remaining index key columns

I does not produce any distributions for non-indexed columns using its
default settings. There is a flag you can set that will instruct AUS to
replicate whatever level of distributions you already have on your
columns. So, if you want distributions on non-indexed columns (useful if
you join or filter on minor columns that are not indexed) you can manually
(or using dostats) produce those distributions and tell AUS to maintain
them. But, as I said, normally it does not produce them. The last thing
that dostats does that AUS does not is to perform a LOW on each complete
index key. Some of the developers working on the optimizer have told me
that this can help, others disagree. When I wrote dostats I adhered to the
former group's recommendation. When John Miller wrote AUS he followed the
latter group's advice.

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 Mon, Jun 30, 2014 at 1:59 PM, LARRY SORENSEN <lsorensen25@msn.com> wrote:

> Does AUS, if set up, run "UPDATE STATISTICS" both medium and high depenting
> upon what is needed?
>
> > To: ids@iiug.org
> > From: art.kagel@gmail.com
> > Subject: Re: Update statistics issue [33296]
> > Date: Fri, 27 Jun 2014 09:18:13 -0400
> >
> > "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
> > >
> > >
> > >
> > >
> >
>
> *******************************************************************************
> > > Forum Note: Use "Reply" to post a response in the discussion forum.
> > >
> > >
> >
> > --089e01182b54c5879104fcd123c5
> >
> >
> >
>
> *******************************************************************************
> > 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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