Обсуждение: Wal archiving and streaming replication
Hi! Do I need setup wal archiving (archiving_mode = on) setup when I use streaming replication? -- View this message in context: http://postgresql.1045698.n5.nabble.com/Wal-archiving-and-streaming-replication-tp4726040p4726040.html Sent from the PostgreSQL - general mailing list archive at Nabble.com.
On Tue, Aug 23, 2011 at 02:01:10AM -0700, alexondi wrote: > Hi! > Do I need setup wal archiving (archiving_mode = on) setup when I use > streaming replication? yes http://www.postgresql.org/docs/current/interactive/high-availability.html
On Tuesday, August 23, 2011 4:14:15 am Ray Stell wrote: > On Tue, Aug 23, 2011 at 02:01:10AM -0700, alexondi wrote: > > Hi! > > Do I need setup wal archiving (archiving_mode = on) setup when I use > > streaming replication? > > yes > http://www.postgresql.org/docs/current/interactive/high-availability.html Actually no. Streaming will work without archiving. For a quick introduction see: http://wiki.postgresql.org/wiki/Binary_Replication_Tutorial#5_Minutes_to_Simple_Replication -- Adrian Klaver adrian.klaver@gmail.com
On Tue, Aug 23, 2011 at 06:23:58AM -0700, Adrian Klaver wrote: > On Tuesday, August 23, 2011 4:14:15 am Ray Stell wrote: > > On Tue, Aug 23, 2011 at 02:01:10AM -0700, alexondi wrote: > > > Hi! > > > Do I need setup wal archiving (archiving_mode = on) setup when I use > > > streaming replication? > > > > yes > > http://www.postgresql.org/docs/current/interactive/high-availability.html > > Actually no. Streaming will work without archiving. For a quick introduction > see: > > http://wiki.postgresql.org/wiki/Binary_Replication_Tutorial#5_Minutes_to_Simple_Replication right, you don't need to. I find it to be a best practice, which is different.
On Tue, Aug 23, 2011 at 7:17 PM, Ray Stell <stellr@cns.vt.edu> wrote:
On Tue, Aug 23, 2011 at 06:23:58AM -0700, Adrian Klaver wrote:right, you don't need to. I find it to be a best practice, which is different.
> On Tuesday, August 23, 2011 4:14:15 am Ray Stell wrote:
> > On Tue, Aug 23, 2011 at 02:01:10AM -0700, alexondi wrote:
> > > Hi!
> > > Do I need setup wal archiving (archiving_mode = on) setup when I use
> > > streaming replication?
> >
> > yes
> > http://www.postgresql.org/docs/current/interactive/high-availability.html
>
> Actually no. Streaming will work without archiving. For a quick introduction
> see:
>
> http://wiki.postgresql.org/wiki/Binary_Replication_Tutorial#5_Minutes_to_Simple_Replication
Question:
Is it a best practice to keep cluster in Archive_mode = on and setup streaming replication or just leave archive_mode=off?
---
Regards,
Raghavendra
EnterpriseDB Corporation
On Tue, Aug 23, 2011 at 08:30:55PM +0530, Raghavendra wrote: > > Is it a best practice to keep cluster in Archive_mode = on and setup > streaming replication or just leave archive_mode=off? Depends. The reason for creating WAL is in case they are needed for recovery. In the event that the stby host goes down, if bringing it back into service exceeds wal_keep_segments on the primary then you would need to rebuild the standby. This is a local decision and should be made based on business rules.
On Tue, Aug 23, 2011 at 10:49 PM, Ray Stell <stellr@cns.vt.edu> wrote:
On Tue, Aug 23, 2011 at 08:30:55PM +0530, Raghavendra wrote:Depends. The reason for creating WAL is in case they are needed for recovery.
>
> Is it a best practice to keep cluster in Archive_mode = on and setup
> streaming replication or just leave archive_mode=off?
In the event that the stby host goes down, if bringing it back into service
exceeds wal_keep_segments on the primary then you would need to rebuild
the standby. This is a local decision and should be made based on business
rules.
Thanks Ray.
--Raghav