Обсуждение: Backup Postgre server
Hello, I have a pg8.3 server (an 8.4 upgrade is scheduled) on Windows. I would like an other pg server in backup in case of hardware problem on my first server. I use read/write queries and I would like the second pg become master without any human intervention. I saw Slony, but it seems that the backup server is a read-only server which is not good for me. I also saw pgpool. Is it a good solution for me? Does it work alone or with Slony? Is a Windows version exist? Finally, I saw others products like pgcluster or Bucardo, but I don't understand the differences between all those products... Can somebody help me? :) Thanks in advance
On Mon, Nov 23, 2009 at 03:19:17AM -0800, AnthonyV wrote: > Hello, > > I have a pg8.3 server (an 8.4 upgrade is scheduled) on Windows. I > would like an other pg server in backup in case of hardware problem > on my first server. > > I use read/write queries and I would like the second pg become > master This part can be done if you separate the read queries from the ones that write and/or must be current as of the most recent commit on the master. Slony works for doing a manual failover. > without any human intervention. This part is generally a very bad idea. What happens if there is a bug in the crash detection system? In broad generality, a sensor attached directly to an actuator is a booby trap, and this case is no exception. Cheers, David. -- David Fetter <david@fetter.org> http://fetter.org/ Phone: +1 415 235 3778 AIM: dfetter666 Yahoo!: dfetter Skype: davidfetter XMPP: david.fetter@gmail.com iCal: webcal://www.tripit.com/feed/ical/people/david74/tripit.ics Remember to vote! Consider donating to Postgres: http://www.postgresql.org/about/donate
2009/11/23 AnthonyV <avequeau@gmail.com>: > Hello, > > I have a pg8.3 server (an 8.4 upgrade is scheduled) on Windows. > I would like an other pg server in backup in case of hardware problem > on my first server. > > I use read/write queries and I would like the second pg become master > without any human intervention. ugh. risky (see David's post) > > I saw Slony, but it seems that the backup server is a read-only server > which is not good for me. hmm, half-true. with slony-I, the slave server is read only as long as the replication is taking place. when you detect that your master server is dead, you can issue a FAILOVER and the slave will be fully operational (R/W). see http://slony.info/documentation/failover.html > I also saw pgpool. Is it a good solution for me? Does it work alone or > with Slony? Is a Windows version exist? Pgpool can work alone (in so-called replication mode), but it has some important limitations (volatile functions). Is it good for you? depends on your db usage patterns (what types of queries are used) AFAIK, most real world postgres clustering setups use a combination of a load balancer (eg pgpool) and replication tool (eg Slony-I) > > Finally, I saw others products like pgcluster or Bucardo, but I don't > understand the differences between all those products... > pgcluster is (at best) and early beta. bucardo is similar to slony but claims to be asynchronous multi master (not sure how it's possible :-) did you see http://wiki.postgresql.org/wiki/Replication,_Clustering,_and_Connection_Pooling ? did you see http://www.postgresql.org/docs/8.4/static/continuous-archiving.html ? cheers, -- Filip Rembiałkowski JID,mailto:filip.rembialkowski@gmail.com http://filip.rembialkowski.net/
On 23 nov, 13:20, plk.zu...@gmail.com (Filip Rembiałkowski) wrote: > 2009/11/23 AnthonyV <avequ...@gmail.com>: > > > Hello, > > > I have a pg8.3 server (an 8.4 upgrade is scheduled) on Windows. > > I would like an other pg server in backup in case of hardware problem > > on my first server. > > > I use read/write queries and I would like the second pg become master > > without any human intervention. > > ugh. risky (see David's post) > > > > > I saw Slony, but it seems that the backup server is a read-only server > > which is not good for me. > > hmm, half-true. > with slony-I, the slave server is read only as long as the replication > is taking place. > when you detect that your master server is dead, you can issue a > FAILOVER and the slave will be fully operational (R/W). > see http://slony.info/documentation/failover.html > > > I also saw pgpool. Is it a good solution for me? Does it work alone or > > with Slony? Is a Windows version exist? > > Pgpool can work alone (in so-called replication mode), but it has some > important limitations (volatile functions). > Is it good for you? depends on your db usage patterns (what types of > queries are used) > > AFAIK, most real world postgres clustering setups use a combination of > a load balancer (eg pgpool) and replication tool (eg Slony-I) > > > > > Finally, I saw others products like pgcluster or Bucardo, but I don't > > understand the differences between all those products... > > pgcluster is (at best) and early beta. > bucardo is similar to slony but claims to be asynchronous multi master > (not sure how it's possible :-) > > did you seehttp://wiki.postgresql.org/wiki/Replication,_Clustering,_and_Connecti... > ? > > did you seehttp://www.postgresql.org/docs/8.4/static/continuous-archiving.html > ? > > cheers, > > -- > Filip Rembiałkowski > JID,mailto:filip.rembialkow...@gmail.comhttp://filip.rembialkowski.net/ > > -- > Sent via pgsql-general mailing list (pgsql-gene...@postgresql.org) > To make changes to your subscription:http://www.postgresql.org/mailpref/pgsql-general Thank you for your advices and your reactivity. I'll try to use Slony-I. Once again thank you.