| From: | Bruce Momjian <maillist(at)candle(dot)pha(dot)pa(dot)us> |
|---|---|
| To: | Andreas(dot)Zeugswetter(at)telecom(dot)at (Zeugswetter Andreas SARZ) |
| Cc: | raines(at)SLAC(dot)Stanford(dot)EDU, pgsql-hackers(at)hub(dot)org |
| Subject: | Re: AW: [HACKERS] Re: Let's talk up 6.3 |
| Date: | 1998-03-30 18:35:34 |
| Message-ID: | 199803301835.NAA18398@candle.pha.pa.us |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-hackers |
>
> > Would a rule be that
> > if the first attribute of an index is unique, then additional
> > attributes are basically useless?
>
> For PostgreSQL this is currently true, since indexes are currently not
> used for order by. If you have a unique first column in an index,
> then all following columns could only be used for sorting,
> not for faster access (access actually gets worse).
Sorry, don't follow this logic. He is not restricting on the first
field of the index, so the index is not used.
--
Bruce Momjian | 830 Blythe Avenue
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