Обсуждение: Warm Standby on 8.4.7
Hello,
Is it possible to set up a warm standby pair of postgres instances without using the pg_standby utility? The PG manuals appear to say it is possible. But I don’t see the details of how to set this up. How do you keep the standby instance in permanent recovery mode?
Thanks.
Alanoly.
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On Wed, Apr 13, 2011 at 8:53 PM, Alanoly Andrews <alanolya@invera.com> wrote: > Is it possible to set up a warm standby pair of postgres instances without > using the pg_standby utility? The PG manuals appear to say it is possible. > But I don’t see the details of how to set this up. How do you keep the > standby instance in permanent recovery mode? It is possible. You just need to write a utility very similar to pg_standby. -- Simon Riggs http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training & Services
Alanoly Andrews <alanolya@invera.com> writes: > Hello, > > Is it possible to set up a warm standby pair of postgres instances > without using the pg_standby utility? The PG manuals appear to say it > is possible. But I dont see the details of how to set this up. How > do you keep the standby instance in permanent recovery mode? Certainly if you implement the same or possibly extended logic yourself in whatever language you are comfortable with. Myself and others have been doing warm-standby since WALs were invented :-) When the company I work for started requiring that WS servers be helf back a configurable time lag from production, I made some minor mods to our version of the standby script, now written in Python, to make it happen. WALs now have to pass sanity and aging checks before being applied. HTH -- Jerry Sievers Postgres DBA/Development Consulting e: gsievers19@comcast.net p: 305.321.1144
On Thu, Apr 14, 2011 at 1:06 PM, Alanoly Andrews <alanolya@invera.com> wrote: > Thanks, Simon, for your quick response. I'll try it out with your pg_standby utility. And...if I may ask you one more questionon the subject, once the standby is up and running, is there a way to determine whether it is in synch with the primarydatabase (in terms of the last WAL applied)? I guess that the standby cannot be queried as it would be in permanentrecovery mode. At 8.4, no, you cannot query the standby. 9.0 introduces the Hot Standby feature to allow you to query the standby. -- Simon Riggs http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training & Services