I use pgsql 9.0.3 and I know that postgresql tries to use the fields in indexes instead of the original table if it possible
But when I run
SELECT COUNT(id) FROM tab
or
SELECT COUNT(*) FROM tab
where there "id" is PRIMARY KEY and there are other indexes there I get execution plan that doesnt use any indexes, but sequentab scanning the original table.
"Aggregate (cost=38685.98..38685.99 rows=1 width=0)"
" -> Seq Scan on tab (cost=0.00..36372.38 rows=925438 width=0)"
Why is it so?
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Paul
