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From: Dave Cramer <[email protected]>
To: 이상원 <[email protected]>
Cc: Tom Lane <[email protected]>
Cc: [email protected]
Subject: Re: Connection Timeout Issue due to intermittent non-response of Postgre database
Date: Wed, 8 Nov 2023 11:50:18 -0500
Message-ID: <CADK3HHK-4kcSag0PMLbKUhpOA_fymMn3f_TZcE34562es1g75g@mail.gmail.com> (raw)
In-Reply-To: <CALFNBwc86ueiFq528jmeEMNkK0mearWMB3NaaY_5PdYWSxdpmQ@mail.gmail.com>
References: <CALFNBwepVWW6esjue4Eu9_EJ2tnA7KiSzt0ftAiivXiRGj87JQ@mail.gmail.com>
	<[email protected]>
	<CALFNBwc86ueiFq528jmeEMNkK0mearWMB3NaaY_5PdYWSxdpmQ@mail.gmail.com>

On Sun, 5 Nov 2023 at 19:45, 이상원 <[email protected]> wrote:

> Thanks, I'll check it out. then, I will update to all.
>
> 2023년 11월 5일 (일) 오전 12:33, Tom Lane <[email protected]>님이 작성:
>
>> =?UTF-8?B?7J207IOB7JuQ?= <[email protected]> writes:
>> > The Postgre database does not respond intermittently, causing a
>> connection
>> > timeout in the Spring Framework. There is no regularity in the
>> occurrence
>> > of connection timeouts and they do not repeat continuously. Not easy to
>> > track.
>>
>> I'd try turning on statement logging, and maybe also statement duration
>> logging, and then matching up the times of observed client-side outages
>> with what's happening according to the postmaster log.  Connection
>> and disconnection logging might be useful too.
>>
>> A likely bet about the root cause is an unreasonably short connection
>> timeout in some network infrastructure between your client and the
>> database server.  That would manifest as both sides reporting that the
>> other side disconnected (not necessarily at the same time, but for the
>> same connection).  If so, it could likely be cured by adjusting the
>> database's TCP keepalive settings.  But you ought to gather data
>> first.
>>
>
I would have to agree that it is very likely a network issue.

Dave

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