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IDS Forum

Re: dbexport skipped update statistics high

Posted By: Fernando Nunes
Date: Monday, 5 December 2011, at 11:41 a.m.

In Response To: Re: dbexport skipped update statistics high (Art Kagel)

On Mon, Dec 5, 2011 at 4:10 PM, Art Kagel <art.kagel@gmail.com> wrote:

> You are correct Fernando. Don't know where my head was earlier. CREATE
> INDEX also produces HIGH distributions for the first column of each index.
>
However, create index does NOT produce and stats for columns other than the
> single lead column, and it does so indescriminately - meaning that if
> several indexes start with the same column you incur the cost of the
>

True. Just HIGH for the heading column of the index. I cannot quantify the
overhead of doing it "repeatedly" for several indexes starting with the
same column.
My feeling is that the biggest impact is on the ordering but that must be
performed anyway.
In any case this is a good point. Any performance architect around? :)

> distributions for that single lead column several times over. Anyway, the
> HIGH stats on the second or later columns that differ when multiple
> indexes start with the same subset key are not performed and that can make
> a big difference.
>

Yes. Depending on the script you use for the stats. From your words I
imagine your's take this into consideration. I would have to check mine...
In reality I only witnessed this in one situation (SAP system), but I'm
sure it can happen in a lot of cases
Maybe Bill is hitting something like this. But in any case, the base
problem should not tbe he lack of the UPDATE STATISTICS HIGH in the export
file...
Regards

>
> Art
>
> Art S. Kagel
> Advanced DataTools (www.advancedatatools.com)
> Blog: http://informix-myview.blogspot.com/
>
> Disclaimer: Please keep in mind that my own opinions are my own opinions
> and do not reflect on my employer, Advanced DataTools, 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, Dec 5, 2011 at 7:31 AM, Fernando Nunes <domusonline@gmail.com
> >wrote:
>
> > Art: Did you check that? That's not what the manual says and it's not
> what
> > I thought... But I admit I didn't check it.
> > Meanwhile, accordingly to the manual, it should use a precision of 1.0
> for
> > tables with less than 1M rows and usually it uses 0.5.
> > Maybe this explains the bad performance...
> > Regards.
> >
> > On Mon, Dec 5, 2011 at 11:40 AM, Art Kagel <art.kagel@gmail.com> wrote:
> >
> > > Fernando: CREATE INDEX only does MEDIUM on the key columns!
> > >
> > > Bill: Did you double check the source database? Dbexport should be
> > > exporting exactly the stats that existed on the source, HIGH, MEDIUM,
> > > whatever.
> > >
> > > Art
> > >
> > > Art S. Kagel
> > > Advanced DataTools (www.advancedatatools.com)
> > > Blog: http://informix-myview.blogspot.com/
> > >
> > > Disclaimer: Please keep in mind that my own opinions are my own
> opinions
> > > and do not reflect on my employer, Advanced DataTools, 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 Sun, Dec 4, 2011 at 11:45 PM, Bill Hamilton <garage_dba@hotmail.com
> > > >wrote:
> > >
> > > > Both export server and import server are running 11.70.C3 32 bit.
> > > > The export was from win2008 32bit. The import was onto win2008 64
> bit.
> > > > That makes no difference since import/export uses ascii output/input.
> > > >
> > > > As I said, the export file has no high statistics anywhere.
> > > > We have another win2008 64 bit server that does the same thing upon
> > > > dbexport.
> > > >
> > > > The only reason I run stats after import is the import server runs
> slow
> > > > without high stats being done.
> > > > The sysdistribs table is not part of an export. That is why you
> always
> > > had
> > > > to update stats after import.
> > > > I used to update stats all the time on 9.4 but I thought the new one
> > was
> > > > doing it because I saw all of those
> > > > update stats statements. One day I took a closer look and found it
> was
> > > only
> > > > Medium stats - big surprise.
> > > > I guess I just need to keep doing what I always did.
> > > > I thought that maybe someone else had noticed this and reported it.
> > > > They IBM guys may as well remove the code for "medium" since it is
> just
> > > > slowing the export for no gain to us.
> > > > Apparently there are not many folks using 11.70 at this time or they
> > just
> > > > are not using import/export very often.
> > > >
> > > > It is also annoying that PDQPRIORITY will not work on the free
> > versions.
> > > > This makes import/export darn slow.
> > > > For those of us doing only OLTP there seems not much use for pdq
> except
> > > for
> > > > this purpose).
> > > > I understand that IBM wants to use pdq to extort money out of us.
> Not a
> > > > complaint here - great product.
> > > > We have used IDS since 7.3 .
> > > >
> > > > p.s.: I just now exported a database from the win2008 64 bit server
> > that
> > > I
> > > > had imported into a few days ago and updated statistics upon. It has
> > the
> > > > "high" stats in the export file.
> > > >
> > > > -----Original Message-----
> > > > From: Fernando Nunes
> > > > Sent: Sunday, December 04, 2011 8:12 PM
> > > > To: ids@iiug.org
> > > > Subject: Re: dbexport skipped update statistics high [25530]
> > > >
> > > > This needs checking... But I imagine it skips update statistics high
> > > since
> > > > this is done for columns heading an index... and these are run when
> the
> > > > index is created, so it makes sense.
> > > > But you say you need to run the stats... are you using v11 on the
> > > > development server?
> > > >
> > > > Regards.
> > > >
> > > > On Mon, Dec 5, 2011 at 12:28 AM, Bill Hamilton
> > > > <garage_dba@hotmail.com>wrote:
> > > >
> > > > > This concerns IBM Informix Dynamic Server Version 11.70.TC3IE on
> > > Windows
> > > > > Server 2008 sp2 .
> > > > >
> > > > > I find that the update statistics in the export file has only
> > “medium”
> > > > in
> > > > > it.
> > > > > When I import into another development server I need to remember to
> > > > update
> > > > > stats high or things will creep along.
> > > > > Is there something to set in the onconfig file to get “high” stats
> to
> > > be
> > > > > in
> > > > > the export file?
> > > > >
> > > > >
> > > > >
> > > > >
> > > >
> > > >
> > > >
> > >
> > >
> >
> >
>
> *******************************************************************************
> > > > > Forum Note: Use "Reply" to post a response in the discussion forum.
> > > > >
> > > > >
> > > >
> > > > --
> > > > Fernando Nunes
> > > > Portugal
> > > >
> > > > http://informix-technology.blogspot.com
> > > > My email works... but I don't check it frequently...
> > > >
> > > > --20cf3074b1b44c1b4a04b34ed97e
> > > >
> > > >
> > > >
> > > >
> > >
> > >
> >
> >
>
> *******************************************************************************
> > > > Forum Note: Use "Reply" to post a response in the discussion forum.
> > > >
> > > >
> > > >
> > > >
> > >
> > >
> >
> >
>
> *******************************************************************************
> > > > Forum Note: Use "Reply" to post a response in the discussion forum.
> > > >
> > > >
> > >
> > > --000e0cd4b5b207151104b356c8c5
> > >
> > >
> > >
> > >
> >
> >
>
> *******************************************************************************
> > > Forum Note: Use "Reply" to post a response in the discussion forum.
> > >
> > >
> >
> > --
> > Fernando Nunes
> > Portugal
> >
> > http://informix-technology.blogspot.com
> > My email works... but I don't check it frequently...
> >
> > --0016e648a63022ce3c04b357804d
> >
> >
> >
> >
>
> *******************************************************************************
> > Forum Note: Use "Reply" to post a response in the discussion forum.
> >
> >
>
> --bcaec52999cd3093a804b35a8dc7
>
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>
>

--
Fernando Nunes
Portugal

http://informix-technology.blogspot.com
My email works... but I don't check it frequently...

--20cf303344032dbe6904b35afd5b

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