On 04/10/2015 12:06 PM, Volkan Unsal wrote:
Hi Adrian,
I didn't realize stand-alone was the same thing as single-user mode ––
are you sure? I guess I don't know what the alternative is to "a
stand-alone backend."
As example:
postgres@killi:~> /usr/local/pgsql94/bin/postgres --single -D
/usr/local/pgsql94/data/ postgres
PostgreSQL stand-alone backend 9.4rc1
backend>
Your log entries in the second Gist match the command you have in
init-master.sh in your first Gist.
The alternative is either to use a system script to start Postgres or
pg_ctl:
http://www.postgresql.org/docs/9.3/interactive/app-pg-ctl.html
The server is started using a straightforward call to "postgres". It's
not using the --single flag, which is what I assume is needed for the
single-user mode.
No, single-user mode is a special case for recovering from mistakes:
http://www.postgresql.org/docs/9.3/interactive/app-postgres.html
The postgres command can also be called in single-user mode. The primary
use for this mode is during bootstrapping by initdb. Sometimes it is
used for debugging or disaster recovery; note that running a single-user
server is not truly suitable for debugging the server, since no
realistic interprocess communication and locking will happen. When
invoked in single-user mode from the shell, the user can enter queries
and the results will be printed to the screen, but in a form that is
more useful for developers than end users. In the single-user mode, the
session user will be set to the user with ID 1, and implicit superuser
powers are granted to this user. This user does not actually have to
exist, so the single-user mode can be used to manually recover from
certain kinds of accidental damage to the system catalogs.
In the Gist I do not see a call to postgres by itself. I only see with
--single.
--
Adrian Klaver
adrian.klaver@xxxxxxxxxxx
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