Re: logical replication and statistics

From: Petr Jelinek <petr(dot)jelinek(at)2ndquadrant(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>
Cc: Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: logical replication and statistics
Date: 2017-09-25 17:23:57
Message-ID: 8b3adf2e-402a-5795-e543-b72c4935167d@2ndquadrant.com
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On 25/09/17 19:19, Tom Lane wrote:
> Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> writes:
>> I had two instances on one server with different port. I am sure, so
>> replication was functional. Only one issue is statistics
>
>> Master:
>
>> CREATE TABLE foo(id int primary key, a int);
>> CREATE PUBLICATION test_pub FOR TABLE foo;
>> INSERT INTO foo VALUES(1, 200);
>
>> slave
>
>> CREATE TABLE foo(id int primary key, a int);
>> CREATE SUBSCRIPTION test_sub CONNECTION 'port=5432' PUBLICATION test_pub;
>
>> That was all
>
> In this example, nothing's been done yet by the actual replication
> apply process, only by the initial table sync. Maybe that accounts
> for your not seeing stats?
>

The main replication worker should still be running though. The output
of pg_stat_replication should only be empty if there is nothing running.

--
Petr Jelinek http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services

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