Re: Replication

Martha Stewart called it a Good Thing whenianh@hubspan.com ("Ian Huynh")wrote:
> Seems that there are a number of simultaneous project in trying to implement replication
> for postgres.
>
> Is anyone out there using this feature currently? If so , which package & OS environment.
>
> the latest news was eRServer v1.0.   Is this the same as the v1.2 that Postgres INC announced
> early this year ?
>
> Is there a master-master capability or only master-multi-slave ?

The version of eRServer recently released as free software is not the
latest "production" release, but it is a direct predecessor.

Its operational model is that of "master/possible multiple slaves,"
NOT multimaster.

Multimaster involves some thorny issues surrounding synchronization,
as it is possible for one master to receive a set of changes
concurrently with another master receiving _incompatible_ changes.

PalmOS users see this if they change a particular record on both
desktop and palmtop; the next time they sync, the conflicting record
normally gets duplicated and the user gets to decide how to fix it.

Doing that in a big production database context may not be
possible/acceptable.  You only should do multimaster if you REALLY
know what you're doing.
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