On Mon, Feb 19, 2018 at 01:54:24PM +0000, PG Doc comments form wrote:
> The sample works with a NON-persistent connection (psql -c):
> <quote>
> Standalone Hot Backups
> ...      touch /var/lib/pgsql/backup_in_progress
> psql -c "select pg_start_backup('hot_backup');"
> tar -cf /var/lib/pgsql/backup.tar /var/lib/pgsql/data/
> psql -c "select pg_stop_backup();"
> rm /var/lib/pgsql/backup_in_progress
> tar -rf /var/lib/pgsql/backup.tar /var/lib/pgsql/archive/
> ...
> </quote>

This uses the set of exclusive backup APIs, so with non-persistent
connections the backup can be correctly completed.  Non-exclusive
backups can be defined using 'false' as third argument of 
pg_start_backup() and first argument of pg_stop_backup().  Note that for
pg_start_backup you would also need to define the second boolean
argument to decide if a checkpoint should be immediately taken or not.
So you would have basically the following flow on a persistem
=# SELECT pg_start_backup('my_backup', true_or_false, false);
-- keep connection alive and do stuff.
=# SELECT pg_stop_backup(false);

Do you think that the section "Tips and Examples" should mention
that an exclusive backup method is used for this example?  This may
reduce the confusion.

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