Date: Tue, 24 May 2022 19:57:26 -0400
From: Bruce Momjian <bruce@momjian.us>
To: yanliang lei <msdnchina@163.com>
Cc: "pgsql-docs@lists.postgresql.org" <pgsql-docs@lists.postgresql.org>
Subject: Re: about pg14 new parameter in_hot_standby
Message-ID: <Yo1w5gFqxlo2Ohip@momjian.us>
References: <4d053c3c.91d.180e9eb5298.Coremail.msdnchina@163.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <4d053c3c.91d.180e9eb5298.Coremail.msdnchina@163.com>
Archived-At: 
 <https://www.postgresql.org/message-id/Yo1w5gFqxlo2Ohip%40momjian.us>
Precedence: bulk

On Sun, May 22, 2022 at 11:59:15AM +0800, yanliang lei wrote:
> in the pg14 document(https://www.postgresql.org/docs/14/
> runtime-config-preset.html)
> 
> in_hot_standby parameter:
> 
> Reports whether the server is currently in hot standby mode. 
> 
> When this is on, all transactions are forced to be read-only. 
> 
> Within a session, this can change only if the server is promoted to be primary.
> See Section 27.4 for more information.
> 
> 
> "Within a session, this can change only if the server is promoted to be
> primary"--- I can not understand this statement.

It means when the server is in read/write mode, called "primary" mode vs
"standby" mode.

-- 
  Bruce Momjian  <bruce@momjian.us>        https://momjian.us
  EDB                                      https://enterprisedb.com

  Indecision is a decision.  Inaction is an action.  Mark Batterson