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IDS Forum

Re: Table Fragmentation

Posted By: Emiliano Romero
Date: Wednesday, 3 March 2010, at 3:21 p.m.

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

Ok, first thanks to every one that help me. Uday Kale give's me the
solution. The problem was that in my table I have 4 foreign keys, and
that implicit indexes are not fragmented with the database fragmentation
expresion. I remove that foreign keys and it took 1 second to detach 30
millions rows. Uday told me that explicitly creating those index before
constraint creation should fragment index in the same way as table is
fragmented.

Hope this's the same problem that Joe has.

Thanks again and regards

Kern Doe escribió:
> Your fragmentation scheme looks fine -- and the slowness you have is
> interesting, I would just try:
> 1. running update statistics on the table (or/and)
> 2. review your extent alocation (first/next) in respect to your available
> space.
> Please then share your finding.
>
> ----- Original Message ----
> From: Emiliano Romero <eromero@sitrack.com>
> To: ids@iiug.org
> Sent: Wed, March 3, 2010 10:59:34 AM
> Subject: Re: Table Fragmentation [19175]
>
> Kern, thanks for your reply. I'm on a test enviroment, no one is
> connecting to this server. My fragmention expresion is:
> fragment by expression
>
> partition partpositionold (fechaposicion < datetime(2009-10-01
>
> 00:00:00) year to second ) in datadbs,
>
> partition partposicion10_09 ((fechaposicion < datetime(2009-11-01
>
> 00:00:00) year to second ) AND (fechaposicion >=
>
> datetime(2009-10-01 00:00:00) year to second )
>
> ) in datadbs,
>
> partition partposicion11_09 ((fechaposicion < datetime(2009-12-01
>
> 00:00:00) year to second ) AND (fechaposicion >=
>
> datetime(2009-11-01 00:00:00) year to second )
>
> ) in datadbs,
>
> partition partposicion12_09 ((fechaposicion < datetime(2010-01-01
>
> 00:00:00) year to second ) AND (fechaposicion >=
>
> datetime(2009-12-01 00:00:00) year to second )
>
> ) in datadbs,
>
> partition partposicion01_10 ((fechaposicion < datetime(2010-02-01
>
> 00:00:00) year to second ) AND (fechaposicion >=
>
> datetime(2010-01-01 00:00:00) year to second )
>
> ) in datadbs,
>
> partition partpositionnew (fechaposicion >= datetime(2010-02-01
>
> 00:00:00) year to second ) in datadbs;
> alter table "informix".posicion modify
> extent size 2500000 next size 400000;
>
> I'm detaching partition partposicion10_09 and it takes 1 hour. I also
> test using another dbspace but times are the same.
>
> As you say that it should take seconds, I'm going to keep playing around
> with this.
>
> P/S: Sorry about last mail goes in HTML by error.
>
> Thanks and Regards.
>
> Kern Doe escribió:
>
>> 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
>>
>>
>>
>>
>
> *******************************************************************************
>
>> Forum Note: Use "Reply" to post a response in the discussion forum.
>>
>>
>>
>>
>
> *******************************************************************************
>
>> Forum Note: Use "Reply" to post a response in the discussion forum.
>>
>>
>>
>>
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>
>
> *******************************************************************************
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>

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