| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Ray Ontko <rayo(at)ontko(dot)com> |
| Cc: | "A(dot)Bhuvaneswaran" <bhuvan(at)symonds(dot)net>, pgsql-admin(at)postgresql(dot)org |
| Subject: | Re: Index is not used |
| Date: | 2003-12-20 17:01:18 |
| Message-ID: | 17155.1071939678@sss.pgh.pa.us |
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| Lists: | pgsql-admin |
Ray Ontko <rayo(at)ontko(dot)com> writes:
> BTW, Are you sure that you need to do the "distinct"?
That's a good question to ask.
> If you do,
> then you might try putting the order_date column first in the
> select list. The distinct is requiring that all the rows be sorted
> so that they can be uniqified. I'm hoping that by putting order_date
> first in the that the sort will have to do less work to put them in
> order. (Anyone know if this will actually help?)
I don't believe it will help much if at all. Increasing sort_mem might
help, though.
regards, tom lane
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