The new features in Oracle RAC
11gR2 include Oracle RAC One
Node support which provides
enhanced high availability for
single-instance databases,
protecting them from both planned
and unplanned downtime; Single
Client Access Name (SCAN) that
Oracle Database 11g database
clients use SCAN to connect to the
database with the capability of
resolving to multiple IP addresses,
reflecting multiple listeners in the
cluster handling public client
connections