From: | Yves Vindevogel <yves(dot)vindevogel(at)implements(dot)be> |
---|---|
To: | pgsql-performance(at)postgresql(dot)org |
Subject: | Re: Another question on indexes (drop and recreate) |
Date: | 2005-06-21 16:43:58 |
Message-ID: | 09f30bc29a91c94eecaf7f70aa0c8399@implements.be |
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Lists: | pgsql-performance |
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
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