Обсуждение: Backup from a hot standby
Hi
I'm currently testing Pg 9.0.0 alpha 4 and the hot standby feature (with streaming replication) is working great. I tried to take a filesystem backup from a hot standby, but I guess that is not possible since executing "SELECT pg_start_backup('ss')" returns an error? Or can I just tar $PGDATA and copy the xlog files generated during the backup, since the server is in constant recovery mode? In Oracle it is possible to take backups from a data guard standby, which is very useful since that way making the backups does not stress the master server.
Anyway, I must say that we are very pleased to see HS and SR features, and we hope that 9.0.0 goes to beta (and to an official release) soon!
Regards
Mikko
Sorry for the delay.
On Thu, Mar 4, 2010 at 3:47 PM, Mikko Partio <mpartio@gmail.com> wrote:
> Hi
> I'm currently testing Pg 9.0.0 alpha 4 and the hot standby feature (with
> streaming replication) is working great. I tried to take a filesystem backup
> from a hot standby, but I guess that is not possible since executing "SELECT
> pg_start_backup('ss')" returns an error? Or can I just tar $PGDATA and copy
> the xlog files generated during the backup, since the server is in constant
> recovery mode? In Oracle it is possible to take backups from a data guard
> standby, which is very useful since that way making the backups does not
> stress the master server.
You can take a base backup of the standby while it's in progress, without
calling pg_start_backup() and pg_stop_backup(). Please see the following
document.
http://developer.postgresql.org/pgdocs/postgres/backup-incremental-updated.html
Regards,
--
Fujii Masao
NIPPON TELEGRAPH AND TELEPHONE CORPORATION
NTT Open Source Software Center