Re: Big difference in time returned by EXPLAIN ANALYZE SELECT ... AND SELECT ...

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От Craig Ringer
Тема Re: Big difference in time returned by EXPLAIN ANALYZE SELECT ... AND SELECT ...
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Msg-id 4C4D5BE9.6040808@postnewspapers.com.au
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Ответ на Re: Big difference in time returned by EXPLAIN ANALYZE SELECT ... AND SELECT ...  (Vitalii Tymchyshyn <tivv00@gmail.com>)
Ответы Re: Big difference in time returned by EXPLAIN ANALYZE SELECT ... AND SELECT ...  (Lew <noone@lewscanon.com>)
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On 26/07/10 17:25, Vitalii Tymchyshyn wrote:
> 26.07.10 12:15, Craig Ringer написав(ла):
>> On 26/07/10 16:35, Piotr Gasidło wrote:
>>
>>> Hello,
>>>
>>> I've found strange problem in my database (8.4.4, but also 9.0beta3,
>>> default postgresql.conf, shared_buffers raised to 256MB).
>>>
>>> EXPLAIN ANALYZE SELECT ...
>>> Total runtime: 4.782 ms
>>> Time: 25,970 ms

>> Given that, I'm wondering if the difference in this case is planning
>> time. I can't really imagine the query planner taking 20 seconds (!!) to
>> run, though, no matter how horrifyingly complicated the query and table
>> structure were, unless there was something going wrong.
>>
> Actually it's 20ms, so I suspect your point about planning time is correct.

Oh, a commas-as-fraction-separator locale.

That makes sense. Thanks for the catch.

--
Craig Ringer

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