On 3/8/22 14:01, Nathan Bossart wrote:
On Wed, Mar 02, 2022 at 02:23:51PM -0500, Chapman Flack wrote:
I did not notice this earlier (sorry), but there seems to remain in
backup.sgml a programlisting example that shows a psql invocation
for pg_backup_start, then a tar command, then another psql invocation
for pg_backup_stop.
I think that was only workable for the exclusive mode, and now it is
necessary to issue pg_backup_start and pg_backup_stop in the same session.
(The 'touch backup_in_progress' business seems a bit bogus now too,
suggesting an exclusivity remembered from bygone days.)
I am not sure what a workable, simple example ought to look like.
Maybe a single psql script issuing the pg_backup_start and the
pg_backup_stop, with a tar command in between with \! ?
Several bricks shy of production-ready, but it would give the idea.
Another option might be to just remove this section. The top of the
section mentions that this is easily done using pg_basebackup with the -X
parameter. The bottom part of the section includes more complicated steps
for when "more flexibility in copying the backup files is needed..."
AFAICT the more complicated strategy was around before pg_basebackup, and
the pg_basebackup recommendation was added in 2012 as part of 920febd.
Thoughts?
This makes sense to me. I think pg_basebackup is far preferable to doing
anything like what is described in this section. Unless you are planning
to do something fancy (parallelization, snapshots, object stores, etc.)
then pg_basebackup is the way to go.
Regards,
-David
