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From: sud <suds1434@gmail.com>
Date: Wed, 5 Jun 2024 13:09:12 +0530
Message-ID: <CAD=mzVVhE4Y637XOkqK1yMzP6U2aRhBi5xTcEZw6_Ppppb6mqA@mail.gmail.com>
Subject: Re: Long running query causing XID limit breach
To: Simon Elbaz <elbazsimon9@gmail.com>, Laurenz Albe <laurenz.albe@cybertec.at>
Cc: yudhi s <learnerdatabase99@gmail.com>, 
	pgsql-general <pgsql-general@lists.postgresql.org>
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On Wed, 5 Jun, 2024, 12:39 pm Simon Elbaz, <elbazsimon9@gmail.com> wrote:

> Hi,
>
> I am following this very interesting thread.
>
> From the documentation
> https://www.postgresql.org/docs/current/runtime-config-client.html#GUC-ID=
LE-IN-TRANSACTION-SESSION-TIMEOUT,
> the 0 value will disable the timeout (not -1).
>
>
>
> On Wed, Jun 5, 2024 at 8:25=E2=80=AFAM sud <suds1434@gmail.com> wrote:
>
>> Hello Laurenz,
>>
>> Thank you so much.This information was really helpful for us
>> understanding the working of these parameters.
>>
>> One follow up question i have , as we are setting one of the
>> standby/replica with value idle_in_transaction_session_timeout=3D-1 whic=
h can
>> cause the WAL's to be heavily backlogged in a scenario where we have a
>> query running for very long time on that instance. So in that case will
>> there be chances of instance restart and if that can be avoided anyway?
>>
>> And the plan is to set these system parameters with different values in
>> writer/read replica , so in that case if we apply the "alter system"
>> command on the primary , won't the WAL going to apply those same command=
s
>> forcibly on reader instance making those same as the writer instance
>> configuration( but we want the reader replica configuration to be differ=
ent
>> from writer)?
>>
>> Appreciate your guidance.
>>
>>
>
My apologies. I was meant to say setting up "max_standby_streaming_delay"
To -1. Which means unlimited lag.

>

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<div dir=3D"auto"><div><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D=
"gmail_attr">On Wed, 5 Jun, 2024, 12:39 pm Simon Elbaz, &lt;<a href=3D"mail=
to:elbazsimon9@gmail.com" target=3D"_blank" rel=3D"noreferrer">elbazsimon9@=
gmail.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=
=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir=
=3D"ltr"><div>Hi,</div><div><br></div><div>I am following this very interes=
ting thread.</div><div><br></div><div>From the documentation <a href=3D"htt=
ps://www.postgresql.org/docs/current/runtime-config-client.html#GUC-IDLE-IN=
-TRANSACTION-SESSION-TIMEOUT" rel=3D"noreferrer noreferrer" target=3D"_blan=
k">https://www.postgresql.org/docs/current/runtime-config-client.html#GUC-I=
DLE-IN-TRANSACTION-SESSION-TIMEOUT</a>, the 0 value will disable the timeou=
t (not -1).</div><div><br></div><div><br></div></div><br><div class=3D"gmai=
l_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Wed, Jun 5, 2024 at 8:25=
=E2=80=AFAM sud &lt;<a href=3D"mailto:suds1434@gmail.com" rel=3D"noreferrer=
 noreferrer" target=3D"_blank">suds1434@gmail.com</a>&gt; wrote:<br></div><=
blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-l=
eft:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr"><div>Hell=
o Laurenz,</div><div><br></div><div>Thank you so much.This information was =
really helpful=C2=A0for us understanding=C2=A0the working of these paramete=
rs.</div><div><br></div><div>One follow up question i have , as we are sett=
ing one of the standby/replica with value idle_in_transaction_session_timeo=
ut=3D-1 which can cause=C2=A0the WAL&#39;s to be heavily backlogged in a sc=
enario=C2=A0where we have a query running for very long time on that instan=
ce. So in that case will there be chances of instance restart and if that c=
an be avoided anyway?</div><div><br></div><div>And the plan is to set these=
 system=C2=A0parameters=C2=A0with different values in writer/read replica ,=
 so in that case if we apply the &quot;alter system&quot; command on the pr=
imary , won&#39;t the WAL=C2=A0going to apply those same commands forcibly =
on reader instance making those same as the writer instance configuration( =
but we want the=C2=A0reader replica configuration to be different from writ=
er)?=C2=A0</div><div><br></div><div>Appreciate=C2=A0your guidance.</div><di=
v class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">=C2=A0</div><=
/div></div></blockquote></div></blockquote></div></div><div dir=3D"auto"><b=
r></div><div dir=3D"auto">My apologies. I was meant to say setting up &quot=
;max_standby_streaming_delay&quot; To -1. Which means unlimited lag.=C2=A0<=
/div><div dir=3D"auto"><div class=3D"gmail_quote"><blockquote class=3D"gmai=
l_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left=
:1ex"><div class=3D"gmail_quote"><blockquote class=3D"gmail_quote" style=3D=
"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-le=
ft:1ex">
</blockquote></div>
</blockquote></div></div></div>

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