| Lists: | pgsql-admin |
|---|
| From: | Mikko Partio <mpartio(at)gmail(dot)com> |
|---|---|
| To: | pgsql-admin(at)postgresql(dot)org |
| Subject: | Backup from a hot standby |
| Date: | 2010-03-04 06:47:20 |
| Message-ID: | 2ca799771003032247w2799229dy3381798a723d044f@mail.gmail.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Lists: | pgsql-admin |
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
| From: | Fujii Masao <masao(dot)fujii(at)gmail(dot)com> |
|---|---|
| To: | mpartio(at)gmail(dot)com |
| Cc: | pgsql-admin(at)postgresql(dot)org |
| Subject: | Re: Backup from a hot standby |
| Date: | 2010-04-05 08:34:47 |
| Message-ID: | u2s3f0b79eb1004050134v969191cbxe40b90b60732c091@mail.gmail.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Lists: | pgsql-admin |
Sorry for the delay.
On Thu, Mar 4, 2010 at 3:47 PM, Mikko Partio <mpartio(at)gmail(dot)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