Обсуждение: [GENERAL] WAL history files - Pgsql 9.2
Hi guys,
Are the history files copied with the wal_files? Or I have to do it separated?
00000003.history': No such file or directory
I'm using PostgreSQL 9.2.
Cheers
Patrick
On Mon, Dec 12, 2016 at 7:48 AM, Patrick B <patrickbakerbr@gmail.com> wrote:
Hi guys,Are the history files copied with the wal_files? Or I have to do it separated?00000003.history': No such file or directory
I'm using PostgreSQL 9.2.
Can you please explain the scenario you are referring to ? during streaming replication ? or during standby promotion ?
Regards,
Venkata B N
Database Consultant
2016-12-12 12:00 GMT+13:00 Venkata B Nagothi <nag1010@gmail.com>:
On Mon, Dec 12, 2016 at 7:48 AM, Patrick B <patrickbakerbr@gmail.com> wrote:Hi guys,Are the history files copied with the wal_files? Or I have to do it separated?00000003.history': No such file or directory
I'm using PostgreSQL 9.2.Can you please explain the scenario you are referring to ? during streaming replication ? or during standby promotion ?
Sure...
I've got:
> Master01 (sending wal_files to the slaves)
> slave01 (streaming replication from master01 + wal_files)
> slave02 (streaming replication from master01 + wal_files)
I'll turn slave01 into a master; on recovery.conf:
trigger_file = '/tmp/pg_failover_trigger';touch /tmp/pg_failover_trigger
Then, the new scenario will be:
> slave01 (NEW MASTER)
> slave02 (streaming replication from slave01 + wal_files)
Will slave02 be able to switch the timeline using wal_files provided by the new master?
Thanks
2016-12-12 12:09 GMT+13:00 Patrick B <patrickbakerbr@gmail.com>:
2016-12-12 12:00 GMT+13:00 Venkata B Nagothi <nag1010@gmail.com>:On Mon, Dec 12, 2016 at 7:48 AM, Patrick B <patrickbakerbr@gmail.com> wrote:Hi guys,Are the history files copied with the wal_files? Or I have to do it separated?00000003.history': No such file or directory
I'm using PostgreSQL 9.2.Can you please explain the scenario you are referring to ? during streaming replication ? or during standby promotion ?Sure...I've got:> Master01 (sending wal_files to the slaves)> slave01 (streaming replication from master01 + wal_files)> slave02 (streaming replication from master01 + wal_files)I'll turn slave01 into a master; on recovery.conf:trigger_file = '/tmp/pg_failover_trigger';
touch /tmp/pg_failover_trigger
Then, the new scenario will be:
> slave01 (NEW MASTER)> slave02 (streaming replication from slave01 + wal_files)Will slave02 be able to switch the timeline using wal_files provided by the new master?Thanks
No.. it didn't copy. i tested here. I had to manually copy the history file from /var/lib/pgsql/9.2/data/pg_xlogs from the new master to the same directory on the slaves.
On Mon, Dec 12, 2016 at 9:31 AM, Patrick B <patrickbakerbr@gmail.com> wrote: > No.. it didn't copy. i tested here. I had to manually copy the history file > from /var/lib/pgsql/9.2/data/pg_xlogs from the new master to the same > directory on the slaves. An archive command is able to properly fetch the history files to define a new timeline. If you rely only on streaming replication, only 9.3 and newer versions are able to do that: the replication protocol has been extended at this point to allow a standby to fetch from a primary history files. -- Michael