Re: Establishing remote connections is slow

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От Tom Lane
Тема Re: Establishing remote connections is slow
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Msg-id 20244.1326820717@sss.pgh.pa.us
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Ответ на Re: Establishing remote connections is slow  ("Kevin Grittner" <Kevin.Grittner@wicourts.gov>)
Ответы Re: Establishing remote connections is slow  ("Kevin Grittner" <Kevin.Grittner@wicourts.gov>)
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"Kevin Grittner" <Kevin.Grittner@wicourts.gov> writes:
> Mindaugas �ak�auskas<mindas@gmail.com> wrote:
>> The essence is that establishing remote connection takes anywhere
>> from 10 to 30 seconds. Once connected, the queries are fast

> The only time I've seen something similar, there was no reverse DNS
> entry to go from IP address to host name.  Adding that corrected the
> issue.  I would try that.

> If that fixes it, the questions would be whether PostgreSQL is doing
> an unnecessary reverse DNS lookup.

Having log_hostname off is supposed to prevent us from attempting a
reverse DNS lookup ... but it would be worth checking into whether one
is happening anyway.  (I would think though that such activity would
be visible in strace/truss output.  Perhaps you should turn log_hostname
*on* and verify that you see the lookup activity in strace that wasn't
there before.)

            regards, tom lane

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