Oracle Database 11g Release 1 (11.1) offers an integrated suite of high availability (HA) solutions and Maximum Availability Architecture (MAA) best practrices that provide:
High availability to eliminate or minimize both planned and unplanned downtime
Unmatched data protection
Flexible deployment options that enhance overall performance and scalability
Reduced cost using low cost platforms, without compromising HA
Maximum return on investment by using all HA components for productive work at all times
For an overview of all of the high availability features available with the Oracle Database, see the "High Availability" chapter in Oracle Database Concepts.
For a list of new high availability features introduced in Oracle Database 11g Release 1 (11.1), see the "Availability" section in Chapter 1 of the Oracle Database New Features Guide.