Hi ,
Yes, It is possible to execute backups on the slave server instead of master.
Below are the steps we run for one of our past customer every day to refresh his Dev/test environments using slave backups.
On Slave:
1. Pause the replication
postgres=# select pg_xlog_replay_pause();
pg_xlog_replay_pause
----------------------
(1 row)
2. Make sure wheather Replication paused or not.
postgres =# select pg_is_xlog_replay_paused();
pg_is_xlog_replay_paused
--------------------------
t
(1 row)
3. Copy the data directory using any one rsync,tar,scp or cp..etc
4. Resume the replication to continue the replication process.
postgres=# select pg_xlog_replay_resume();
pg_xlog_replay_resume
-----------------------
(1 row)
5. Verify the weather replication is resumed or not.
postgres=# select pg_is_xlog_replay_paused();
pg_is_xlog_replay_paused
--------------------------
f
(1 row)
--Chiru
On Thu, May 15, 2014 at 1:55 PM, Bruce Momjian <bruce@xxxxxxxxxx> wrote:
On Thu, May 1, 2014 at 12:39:44PM -0700, bricklen wrote:> 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
Uh, what is the pause for? So the transaction will not be cancelled?Yes.
