"Josh Harrison" <joshques at gmail.com> writes:
> Can Slony used for partial replication of the database? ie., can I
> only replicate parts of the tables(rows or columns) ?

There has been some talk of doing this; it would require making the
replication engine a fair bit more intelligent, which isn't a terrible
idea.

At present, the "level of granularity" that is available is to
replicate on a by-table basis.  You could, in principle, put triggers
on a subscriber to NULL out particular columns and/or add additional
columns.  But dropping out rows or columns altogether isn't possible
as things stand.
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