Re: Maximum text and bytea size?

On Thu, Jun 08, 2006 at 11:18:02AM +0200, Ludek Finstrle wrote:
> Hello,
>
>   I'm not sure if I understand documentation the right way.
> Is the maximum size for text and bytea types 2^30-1 bytes?
> 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. That would theoretically allow
for an unlimited size on verlena columns. I don't remember what the
outcome of that discussion was, though. You should be able to find it in
the archives with enough digging.
--
Jim C. Nasby, Sr. Engineering Consultant      jnasby@pervasive.com
Pervasive Software      http://pervasive.com    work: 512-231-6117
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