Re: Terminate the idle sessions

On Nov 17, 2020, at 10:53 AM, David G. Johnston <david(dot)g(dot)johnston(at)gmail(dot)com<mailto:david(dot)g(dot)johnston(at)gmail(dot)com>> wrote:

On Monday, November 16, 2020, Li Japin <japinli(at)hotmail(dot)com<mailto:japinli(at)hotmail(dot)com>> wrote:

<note>
Consider setting this for specific users instead of as a server default. Client connections managed by connection poolers, or initiated indirectly like those by a remote postgres_fdw using server, should probably be excluded from this timeout.

<note>
<para>
- This parameter should be set to zero if you use postgres_fdw or some
- connection-pooling software, because connections might be closed unexpectedly.
+ This parameter should be set to zero if you use some connection-pooling software, or
+ PostgreSQL servers used by postgres_fdw, because connections might be closed unexpectedly.
</para>
</note>

Prefer mine, “or pg servers used by postgres_fdw”, doesn’t flow.

Could you please explain how the idle-in-transaction interfere the long-running stability?

From the docs (next section):

This allows any locks held by that session to be released and the connection slot to be reused; it also allows tuples visible only to this transaction to be vacuumed. See Section 24.1<https://www.postgresql.org/docs/13/routine-vacuuming.html> for more details about this.

Thanks David! Attached.

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Best regards
Japin Li