Re: Online backup of PostgreSQL data.

You can use pg_dump to creating a backup.

pg_dump -U db_username db_name -f file_name.dump

On Thu, Sep 17, 2015 at 1:45 PM, Albe Laurenz <laurenz(dot)albe(at)wien(dot)gv(dot)at>
wrote:

> John R Pierce wrote:
> > to copy the data directory and have it be useful you need to bracket the
> copy with calls to
> > pg_start_backup() and pg_stop_backup() .... this ensures the data files
> are coherent. this is in
> > fact what pg_basebackup does for you....
>
> I apologize for my fussiness, but this is a misconception I encounter so
> frequently
> that I have to speak up.
>
> The file system copy does not become consistent (isn't that what you
> meant?) if it
> is surrounded by pg_start_backup() and pg_stop_backup(). What happens is
> that
> a) a backup.label file is created that tells recovery where to start
> b) more WAL is generated so that all changes can be replayed safely.
>
> Yours,
> Laurenz Albe
>
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