Yes. This is the proper answer. Mine is shorter, but this is the entire point.
The results you get by enabling PG to run (temporarily) on RO doesn't guarantee production results.
-------- Original message --------
From: "David G. Johnston" <david.g.johnston@gmail.com>
Date: 10/07/2016 5:06 PM (GMT-06:00)
To: xujian <jamesxu@outlook.com>
Cc: Scott Whitney <scott@journyx.com>, pgsql-admin@postgresql.org
Subject: Re: [ADMIN] open database on read only file system
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