| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | "Jim C(dot) Nasby" <jnasby(at)pervasive(dot)com> |
| Cc: | Ludek Finstrle <luf(at)pzkagis(dot)cz>, pgsql-admin(at)postgresql(dot)org |
| Subject: | Re: Maximum text and bytea size? |
| Date: | 2006-06-08 15:55:02 |
| Message-ID: | 28212.1149782102@sss.pgh.pa.us |
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| Lists: | pgsql-admin |
"Jim C. Nasby" <jnasby(at)pervasive(dot)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
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