Jim Nasby wrote:
On Mar 7, 2006, at 2:58 PM, Louis Gonzales wrote:
Based on:
Postgres based Replication Projects
PG Replication
Postgres-R: Dr. Kemme's Site, Paper, Publications, Replication Work,
The Horus Project and Emsemble
DRAGON: Database Replication based on Group Communication
The Slony-1 Project
PGCluster
DBBalancer
PostgreSQL Replicator: Tutorial, Paper, Techdocs
eRServer: Techdocs
DBMirror: Will be in the 7.3 contrib directory.
Usogres: Techdocs
From: http://gborg.postgresql.org/project/pgreplication/
genpage.php?replication_research
I was under the impression that "Postgres-R" - I misspelled it as
"postgresql-R" - is a database clustering software. I downloaded
the sources for this and it's supposed to work with "spread." I
apologize if I'm mistaken?
Well, AfAIK it's quasi-clustering. I'd describe it as a mix between
sync and async multi-master replication. Its concepts are the basis
behind Slony-II AFAIK.
I will certainly take a look into Slony-1, as you suggest. Did you
have any good links to this? Have you gone through an install on
Solaris 9 w/Postgresl v8.0?
WAN != LAN, where my database server is not in the same city as the
target system to cluster with; for my worse case scenario, could be
from east coast to west coast.
The issues you'll run into are that in a high-load scenario, the
latency on that link could become a real issue, as could bandwidth
(actually, bandwidth is probably the bigger issue). The other
downside is that slony is decidedly async; if you have to fail over
you're probably going to lose some recently committed data. As long
as that's not an issue then it's your best bet. If it is an issue,
you'll probably be stuck rolling your own solution using something
like 2PC.
Actually, one more question. Upon further reading, the documentation
stated that any modification done on the master, will have to be
committed to all cluster participants, otherwise it will not commit? Is
it still possible to lose any committed data, with that being true?
As a supplement, I was thinking about using some sort of PITR, in
conjuction with Slony-I to ensure all bases are covered.
You should hop on the slony mailing list if you have any questions
about it.
--
Jim C. Nasby, Sr. Engineering Consultant jnasby@xxxxxxxxxxxxx
Pervasive Software http://pervasive.com work: 512-231-6117
vcard: http://jim.nasby.net/pervasive.vcf cell: 512-569-9461
