"TJ O'Donnell" <tjo@xxxxxxx> writes:
> This I don't get. Why is an index scan not used? Isn't an index supposed
> to help when using > < >= <= too?
> Explain Analyze Select count(smiles) from structure where _c >= 30
> Aggregate (cost=196033.74..196033.74 rows=1 width=32) (actual time=42133.432..42133.434 rows=1
> loops=1)
> -> Seq Scan on structure (cost=0.00..191619.56 rows=1765669 width=32) (actual
> time=8050.437..42117.062 rows=1569 loops=1)
> Filter: (_c >= 30)
Have you ANALYZEd the table lately? That rowcount estimate is off by
about three orders of magnitude :-(
regards, tom lane
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