Chris Kratz <[EMAIL PROTECTED]> writes:
> Does anyone have any idea why there be over a 4s difference between running
> the statement directly and using explain analyze?
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> Aggregate (cost=9848.12..9848.12 rows=1 width=0) (actual
> time=4841.231..4841.235 rows=1 loops=1)
> -> Seq Scan on answer (cost=0.00..8561.29 rows=514729 width=0) (actual
> time=0.011..2347.762 rows=530576 loops=1)
> Total runtime: 4841.412 ms
EXPLAIN ANALYZE's principal overhead is two gettimeofday() kernel calls
per plan node execution, so 1061154 such calls here. I infer that
gettimeofday takes about 4 microseconds on your hardware ... which seems
a bit slow for modern machines. What sort of box is it?
regards, tom lane
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