From: Yves Vindevogel <yves.vindevogel@implements.be>
To: pgsql-performance@postgresql.org
Subject: Re: Another question on indexes (drop and recreate)
Date: Tue, 21 Jun 2005 18:43:58 +0200
Message-ID: <09f30bc29a91c94eecaf7f70aa0c8399@implements.be> (raw)
In-Reply-To: <42B83708.2050706@arbash-meinel.com>
References: <098952ec5af9b040acb9b6b5af743abd@implements.be>
<42B830B3.6060902@arbash-meinel.com>
<821370985653dc1f4166ca634f642ce2@implements.be>
<42B83708.2050706@arbash-meinel.com>
I only add records, and most of the values are "random"
Except the columns for dates, ....
On 21 Jun 2005, at 17:49, John A Meinel wrote:
> Yves Vindevogel wrote:
>
>> And, after let's say a week, would that index still be optimal or
>> would it be a good idea to drop it in the weekend and recreate it.
>
>
> It depends a little bit on the postgres version you are using. If you
> are only ever adding to the table, and you are not updating it or
> deleting from it, I think the index is always optimal.
> Once you start deleting from it there are a few cases where older
> versions would not properly re-use the empty entries, requiring a
> REINDEX. (Deleting low numbers and always adding high numbers was one
> of
> the cases)
>
> However, I believe that as long as you vacuum often enough, so that the
> system knows where the unused entries are, you don't ever have to drop
> and re-create the index.
>
> John
> =:->
>
>
Met vriendelijke groeten,
Bien à vous,
Kind regards,
Yves Vindevogel
Implements
Mail: yves.vindevogel@implements.be - Mobile: +32 (478) 80 82 91
Kempische Steenweg 206 - 3500 Hasselt - Tel-Fax: +32 (11) 43 55 76
Web: http://www.implements.be
First they ignore you. Then they laugh at you. Then they fight you.
Then you win.
Mahatma Ghandi.
Attachments:Pasted Graphic 2.tiff (image/tiff, 5.6K) downloadview image
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-performance@postgresql.org
Cc: yves.vindevogel@implements.be
Subject: Re: Another question on indexes (drop and recreate)
In-Reply-To: <09f30bc29a91c94eecaf7f70aa0c8399@implements.be>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox