Re: "NOT IN" substantially slower in 9.0.2 than 8.3.13 - NOT EXISTS runs fast in both 8.3.13 and 9.0.2

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От Mladen Gogala
Тема Re: "NOT IN" substantially slower in 9.0.2 than 8.3.13 - NOT EXISTS runs fast in both 8.3.13 and 9.0.2
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Msg-id 4D39C58D.4060709@vmsinfo.com
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Ответ на Re: "NOT IN" substantially slower in 9.0.2 than 8.3.13 - NOT EXISTS runs fast in both 8.3.13 and 9.0.2  (Robert Haas <robertmhaas@gmail.com>)
Ответы Re: "NOT IN" substantially slower in 9.0.2 than 8.3.13 - NOT EXISTS runs fast in both 8.3.13 and 9.0.2  (Robert Haas <robertmhaas@gmail.com>)
Список pgsql-performance
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On 1/21/2011 12:09 PM, Robert Haas wrote:
> Looks like the bad selectivity estimate there is what's killing it.
> Not sure I completely understand why 9.0.2 is coming up with such a
> bad estimate, though.
>

I would recommend setting default_statistics_target to 1024 and
effective cache size to 20480MB and see what happens.

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Mladen Gogala
Sr. Oracle DBA
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