| From: | "Dann Corbit" <DCorbit(at)connx(dot)com> |
|---|---|
| To: | "Dann Corbit" <DCorbit(at)connx(dot)com>, "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | "Steve Crawford" <scrawford(at)pinpointresearch(dot)com>, <pgsql-performance(at)postgreSQL(dot)org>, <pgsql-hackers(at)postgreSQL(dot)org> |
| Subject: | Re: Terrible performance on wide selects |
| Date: | 2003-01-23 00:22:51 |
| Message-ID: | D90A5A6C612A39408103E6ECDD77B8294CD864@voyager.corporate.connx.com |
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| Thread: | |
| Lists: | pgsql-hackers pgsql-performance |
[snip]
> So (for instance) if you have 12 variable fields, you would
> store 12 integers at the start of the record.
Additionally, you could implicitly size the integers from the properties
of the column. A varchar(255) would only need an unsigned char to store
the offset, but a varchar(80000) would require an unsigned int.
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