Re: Maximum text and bytea size?

"Jim C. Nasby" <jnasby@pervasive.com> writes:
> On Thu, Jun 08, 2006 at 11:18:02AM +0200, Ludek Finstrle wrote:
>> I read this value in TOAST section. Is my opinion correct?

> From http://www.postgresql.org/docs/8.1/interactive/storage-toast.html:
> "TOAST usurps the high-order two bits of the varlena length word,
> thereby limiting the logical size of any value of a TOAST-able data type
> to 1Gb (2^30 - 1 bytes)."

> There was a proposal made some time ago to allow for a variable-length
> length word format, where one of the bits in each word would specify
> that there was an additional length word.

Hm, I don't remember that.  It seems rather pointless, as I'm quite sure
that the *practical* limit is a great deal less than 1Gb.  Has anyone
done any performance testing of GB-sized toasted values?

            regards, tom lane