Re: LISTEN/NOTIFY for lightweight replication

Ted Shab wrote:
> Hi,
> 
> I'm trying to come up with a relatively simple
> multi-master replication solution.  This is for
> multiple databases that need to be discreet, and
> change relatively infrequently (10-30 updates an
> hour), and almost never update each others data (less
> than once a day).  
> 
> The TCL-based replication project for multi-master is
> troublesome to configure and seems to really impact
> performance.  It can be assumed that the master-slave
> setup will not work for me, nor do we want to purchase
> a commercial soluton, nor can we run this all from one
> central database.

> e.  If there is a field level conflict, raise an
> exception (TBD).

Exception handling and failure recovery are what makes for all the work 
in replication.

I don't think a pure listen/notify setup will be enough because iirc the 
system doesn't guarantee delivery of multiple notifications if >1 are 
queued.

Have you looked into the possibility of using dblink to handle updates 
of each others' data? That would mean your problem reverting to one of 
single-master replication.

-- 
   Richard Huxton
   Archonet Ltd