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From: Michael Paquier <[email protected]>
To: Andres Freund <[email protected]>
Cc: Michael Paquier <[email protected]>
Cc: Petr Jelinek <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: Fujii Masao <[email protected]>
Subject: Re: libpq options
Date: Fri, 2 Mar 2018 10:50:38 +0900
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
	<CAB7nPqRZ-8BkUuF1UR+xzg3J+LDTcafbJ75DZGsfn+++iF5_aw@mail.gmail.com>
	<CAB7nPqTMQYKO4AJ6xfz-btAtvL-=CWxYnkXUOVEQGNk4Ey1k=Q@mail.gmail.com>
	<[email protected]>

On Thu, Mar 01, 2018 at 01:35:54AM -0800, Andres Freund wrote:
> On 2017-11-25 19:05:54 +0900, Michael Paquier wrote:
>> A Boolean value of <literal>true</literal> tells the backend
>> +       to go into walsender mode, wherein a small set of replication commands
>> +       can be issued instead of SQL statements.
> 
> This actually is wrong now I think. Petr?

On more or less HEAD:
$ psql -X -d "replication=1 dbname=postgres"
postgres=# create table aa (a int);
ERROR:  cannot execute SQL commands in WAL sender for physical replication
$ psql -X -d "replication=database dbname=postgres"
postgres=# create table aa (a int);
CREATE TABLE

So one needs to use replication=database in order to be able to issue
normal SQL statements, while replication=true enforces physical
replication where this cannot happen (no connection to a specified
database).
--
Michael


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