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IDS Forum

RE: Table Fragmentation

Posted By: Plugge, Joe R.
Date: Wednesday, 3 March 2010, at 4:21 p.m.

In Response To: Re: Table Fragmentation (Kern Doe)

We have this table that even when totally empty, it chews through tons of locks on the detach:

CREATE RAW TABLE monitor_min_sum (

client INTEGER NOT NULL,

program INTEGER NOT NULL,

site VARCHAR(25,0),

phone CHAR(10) NOT NULL,

calldate DATETIME YEAR TO MINUTE NOT NULL,

calls INTEGER NOT NULL
)
FRAGMENT BY EXPRESSION

PARTITION p201003050700 ((calldate >= datetime(2010-03-05 07:00) year to minute ) AND (calldate <= datetime(2010-03-05 07:59) year to minute ) ) IN dbs3,

PARTITION p201003050600 ((calldate >= datetime(2010-03-05 06:00) year to minute ) AND (calldate <= datetime(2010-03-05 06:59) year to minute ) ) IN dbs3,

PARTITION p201003050500 ((calldate >= datetime(2010-03-05 05:00) year to minute ) AND (calldate <= datetime(2010-03-05 05:59) year to minute ) ) IN dbs3,

PARTITION p201003050400 ((calldate >= datetime(2010-03-05 04:00) year to minute ) AND (calldate <= datetime(2010-03-05 04:59) year to minute ) ) IN dbs3 .......

.... about 800 PARTITIONS ...

EXTENT SIZE 64 NEXT SIZE 64 LOCK MODE ROW;

CREATE UNIQUE INDEX uix_monitor_min_sum ON monitor_min_sum (

client ASC,

program ASC,

site ASC,

phone ASC,

calldate ASC
) USING btree;

-----Original Message-----
From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of Kern Doe
Sent: Wednesday, March 03, 2010 3:07 PM
To: ids@iiug.org
Subject: Re: Table Fragmentation [19197]

As always, this is a very informative explanation I should take notes too.
Thanks Art.
Emiliano, re-strategize your partition now, think ahead for the last partition
scheme "partpositionnew". I assume you will also partition by month same way
as the old ones.

For any reason where you still want to try timing your detach process with the
old partition scheme, try to turn pdq on, it should speed up a little bit.

set pdppriority 50;
alter fragment ...

----- Original Message ----
From: Art Kagel <art.kagel@gmail.com>
To: ids@iiug.org
Sent: Wed, March 3, 2010 2:25:50 PM
Subject: Re: Table Fragmentation [19189]

Emiliano,

Detaching a fragment should generally be very fast, as others have
indicated. However, if you have a non-fragmented index or an index that is
fragmented on a different strategy, then detaching the fragment will cause
the entire index to have to be rebuilt from scratch (which is faster than if
the engine just went through and deleted all of the keys you are about to
detach). That operation is likely what's slowing you down.

Art

Art S. Kagel
Advanced DataTools (www.advancedatatools.com)
IIUG Board of Directors (art@iiug.org)

See you at the 2010 IIUG Informix Conference
April 25-28, 2010
Overland Park (Kansas City), KS
www.iiug.org/conf

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 Wed, Mar 3, 2010 at 10:21 AM, Kern Doe <kern_doe@yahoo.com> wrote:

> Assuming you have your table partitioned properly by month per your saying,
> correct, it should take seconds (or at least in my experience). I think the
> one hour you encountered was mostly for waiting for an available exclusive
> lock - which may be hard for an active large table.
> You may want to try timing again on a real test environment and make sure
> there is absolutely no access to that table.
> Kern --
>
> ----- Original Message ----
> From: Emiliano Romero <eromero@sitrack.com>
> To: ids@iiug.org
> Sent: Wed, March 3, 2010 8:53:52 AM
> Subject: Table Fragmentation [19170]
>
> Hi! I have an historic table (5 months) with about 30 millions record
> per month. Our primary problem is that deleting old data takes too long
> (we have some indexes in that table). So I start making some tests with
> fragmentation.
> I fragment my table with a date expression (monthly), using partitions,
> so here are some question I have about fragmentation.
>
> - It takes like 1 hour to detach a 30 million row partition (1 month).
> Are these normal times? Any idea how can I get better times with that
> amount of data? Everywhere I read people talk about seconds to detach a
> partition.
>
> - Attaching and Detaching result in an exclusive lock in my table. Is
> there some way to avoid an exclusive lock?
>
> I use IBM Informix Dynamic Server Version 11.50.FC5
>
> Thanks and Regards
>
> Emiliano Romero
>
>
>
>

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>
>
>

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>

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