Londiste
Londiste is a more recent queue-based replication software driven by triggers and that's part of the SkyTools project set: http://pgfoundry.org/projects/skytools/.
It's one of the database applications written to support scaling up database operations at Skype. Relative to Slony, Londiste has two highly visible advantages. The first is that it targets a smaller feature set and is therefore less complicated to set up. It also has abstracted away the concept of transporting changes from the master to the slaves a bit more cleanly. The Londiste design is based on a generic queue library that is less coupled to the underlying data transport mechanism used in Slony.
Another advantage for Londiste is that it requires minimal locking in ...
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