From: | Gregory Stark <stark(at)enterprisedb(dot)com> |
---|---|
To: | Martijn van Oosterhout <kleptog(at)svana(dot)org> |
Cc: | pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: Fixed length data types issue |
Date: | 2006-09-07 10:57:26 |
Message-ID: | 87bqpsc5bd.fsf@enterprisedb.com |
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Lists: | pgsql-hackers |
Gregory Stark <stark(at)enterprisedb(dot)com> writes:
> Martijn van Oosterhout <kleptog(at)svana(dot)org> writes:
>
>> So you end up storing the typmod in the Datum itself, which brings you
>> right back to varlena.
>
> Not really since the Datum doesn't actually end up on disk in the case of
> pass-by-reference.
Just brain storming here. But what happens if we make Datum 2*sizeof(pointer)
and stored the typmod and/or attlen in it?
Obviously it means the memory use goes up dramatically. But the disk i/o could
potentially be reduced dramatically as well.
Does it let us do anything else we've been dreaming of but not thought doable?
Does it cause any fundamental problems?
--
Gregory Stark
EnterpriseDB http://www.enterprisedb.com
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