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IDS Forum

Re: dbexport skipped update statistics high

Posted By: Bill Hamilton
Date: Monday, 5 December 2011, at 12:06 p.m.

In Response To: Re: dbexport skipped update statistics high (Fernando Nunes)

Many thanks to all that replied to my post!
I had forgotten about the stats being built when indexes are created.
I should know because it is my intent to remove stats from any proc that is
currently doing stats on a temp table if we ever get all customers onto
11.70 or above.
I think the thing that messed me up is the fact that I still have to import
into a server that is using ids9.4 .
The programmers that use that bitch like Hell if I forget to update stats on
that.
My own box is using the latest IDS and it's not so bad, but even there I
think that update stats seems to help.
Maybe that is just conditioning.

I will experiment as Fernando has suggested.

-----Original Message-----
From: Fernando Nunes
Sent: Monday, December 05, 2011 5:07 AM
To: ids@iiug.org
Subject: Re: dbexport skipped update statistics high [25536]

On Mon, Dec 5, 2011 at 4:45 AM, 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 already said, this is expected behavior, since it's unnecessary. In fact
putting the HIGH stats in the export would cause delays since you'd be
calculating the same thing twice.

> The only reason I run stats after import is the import server runs slow
> without high stats being done.
>

This is strange and you should verify if you don't have histograms after
dbimport (you're using dbimport right?)

> The sysdistribs table is not part of an export. That is why you always had
> to update stats after import.
>

Yes, it's not part of the export as none of the other system catalog. It's
true you should update statistics after importing, and that's why dbexport
includes the instructions to do os (although there are quicker ways to do
it - like in parallel -, so from my point of view it should be optional)

> 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.
>

This should be no surprise because the 11.10 optimization means it creates
distributions while creating indexes.

> 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.
>

The inclusion of the instructions in the SQL file should cause no
noticeable delay. It's not updating the stats... just writing the
instructions.

> Apparently there are not many folks using 11.70 at this time or they just
> are not using import/export very often.
>

I know a few customers using 11.70. But most of them had just used the
dbimport (for the migration). Maybe when 12(?) comes out they use the
dbexport more :)

> 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'm wondering if there is something specific here for the free versions...
My tests were done using the full product...

> 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.
>

Which is strange... If you could check this in a simple "stores" database
it could be interesting. You test results don't match mine...

Regards.

>
> -----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.
>
>

--
Fernando Nunes
Portugal

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

--0016e648a630fe101804b35652b9

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