Re: Effect of large text field data on queries

From: Glen Parker <glenebob(at)nwlink(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Postgres General <pgsql-general(at)postgresql(dot)org>
Subject: Re: Effect of large text field data on queries
Date: 2006-10-26 21:14:04
Message-ID: 4541251C.2080503@nwlink.com
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Tom Lane wrote:
> Glen Parker <glenebob(at)nwlink(dot)com> writes:
>> How much of a TOAST'd field is actually stored in the main heap table?
>> Is there a way to configure that amount?
>
> A pushed-out-of-line value is replaced by a 20-byte pointer structure.
> There's no such thing as partially out-of-line. See
> http://www.postgresql.org/docs/8.1/static/storage-toast.html

Ah, thanks. I think possibly changing the storage on this field may
help some (I will gladly trade storage space for speed). How can I
determine the default storage type for a given TOASTable data type (text
in this case)?

-Glen

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