Re: Backups over slave instead master?

On Thu, May 1, 2014 at 8:54 AM, Shaun Thomas <sthomas(at)optionshouse(dot)com>wrote:

> On 05/01/2014 10:31 AM, Edson Richter wrote:
>
> I'm wondering if would be possible to execute these backups in the slave
>> server instead, so I can avoid the overhead of backups on master system?
>>
>
> If you're on PostgreSQL 9.3, you can backup the slave server safely. If
> not, you'll need to run this command on the master system first:
>
> SELECT pg_start_backup('some-label');
>
> After the backup is done, run this on the master server:
>
> SELECT pg_stop_backup();
>

Or alternatively, if "backup" = pg_dump, then backups can taken from the
slave too. Have a look at pg_xlog_replay_pause() + pg_dump +
pg_xlog_replay_resume().
http://www.postgresql.org/docs/current/static/functions-admin.html#FUNCTIONS-RECOVERY-CONTROL-TABLE