Re: Postgres replication solutions

[Jeff Frost <jeff(at)frostconsultingllc(dot)com>]

On Sat, 29 Jul 2006, Mario Splivalo wrote:

> PIRT restores are not working for me. I did it like this: I issued
> pg_start_backup, then I 'tar cvf - pg_data/ | nc destination 9876'-ed
> the cluster directory, when that was done i did pg_stop_backup, after
> that I deleted pg_xlog directory, and put new WAL files (created after
> backup begun) in directory specified in restore.conf. I started
> postgres, everything went ok. Postgres replayed wal files, and system
> was ready. Then, when new WAL files arrived, I shut down postgres, put
> WAL files in place, restarted postgres, but it complained, and didn't
> replay newly created wal files. It only does so when I 'recreate'
> original filesystem backup.

That is how PITR works.  You will always have to redo the base backup before 
being able to restore again, can't just start the replay from a previously 
restored version.  You could however, just replay from your original base 
backup if you're keeping those archived WAL files.

> > Another option is using pgpool's replication.
>
> I considered that too, but that adds another layer between the clients
> and postgres itself, and it allows for only two servers, and I realy
> don't need failover cluster capabilities.
>
> 	Mike

--
Jeff Frost, Owner 	<jeff(at)frostconsultingllc(dot)com>
Frost Consulting, LLC 	http://www.frostconsultingllc.com/
Phone: 650-780-7908	FAX: 650-649-1954