| From: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Robert Treat <xzilla(at)users(dot)sourceforge(dot)net>, josh(at)agliodbs(dot)com, "scott(dot)marlowe" <scott(dot)marlowe(at)ihs(dot)com>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Default Stats Revisited |
| Date: | 2004-03-12 04:40:29 |
| Message-ID: | 200403120440.i2C4eTo01503@candle.pha.pa.us |
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| Lists: | pgsql-hackers |
Tom Lane wrote:
> Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> writes:
> > Another idea is whether a foreign key column should get extra
> > statistics?
>
> In practice, both ends of an FK relationship have to be indexed,
> so I don't see that we need any extra special case for that.
Do they? We don't create an index automatically when using REFERENCES.
We do create an index for PRIMARY KEY.
I was just wondering if the REFERENCES column is more sensitive to join
usage and would benefit from more accurate statistics even if it doesn't
have an index.
--
Bruce Momjian | http://candle.pha.pa.us
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 359-1001
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