| From: | Bruce Momjian <maillist(at)candle(dot)pha(dot)pa(dot)us> |
|---|---|
| To: | mimo(at)interdata(dot)com(dot)pl (Michal Mosiewicz) |
| Cc: | hackers(at)postgreSQL(dot)org |
| Subject: | Re: [HACKERS] Optimizer fails? |
| Date: | 1998-03-25 05:33:15 |
| Message-ID: | 199803250533.AAA26799@candle.pha.pa.us |
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| Lists: | pgsql-hackers |
> Seq Scan on log (cost=105832.15 size=699588 width=62)
>
> There is an index on log table, dt field. The index is b-tree.
> However it doesn't seem to be used. (Of course I have vacuumed it). The
> table has about 2M records. I don't think that Seq Scan is a good idea.
>
> Also, what if I agregate it on dt field to count(*) or sum some values.
> It would be sequentially scanned, then sorted, then grouped and finally
> agregated, right?
I assume you have vacuum analyze too? It may help.
--
Bruce Momjian | 830 Blythe Avenue
maillist(at)candle(dot)pha(dot)pa(dot)us | Drexel Hill, Pennsylvania 19026
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