Re: BUG #15387: explain analyze timing on bug?

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От Tom Lane
Тема Re: BUG #15387: explain analyze timing on bug?
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Msg-id 19889.1537241223@sss.pgh.pa.us
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Ответ на BUG #15387: explain analyze timing on bug?  (PG Bug reporting form <noreply@postgresql.org>)
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=?utf-8?q?PG_Bug_reporting_form?= <noreply@postgresql.org> writes:
> why turn timing on increment about 26ms ?

That's the cost of reading the system clock 200000 times (once per
entry and exit to the SeqScan node).  So apparently that takes about
130ns on your hardware, which is not great, but not awful either.

See

https://www.postgresql.org/message-id/flat/31856.1400021891%40sss.pgh.pa.us

for some more context.

            regards, tom lane


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