Re: horizontal sharding

what about queries that need to do joins or aggregate reporting across the
partitions?!?  I can't see how that could be done transparently short of
something like Oracle RAC.
GridSQL actually does a nice job of breaking up the query and optimizing it
appropriately to handle cross node joins. There are agents running on each
of the nodes that handles the inter-node communication allowing it to be
transparent to the calling application.

--
Jim Mlodgenski
EnterpriseDB (http://www.enterprisedb.com)