Oracle RAC databases provide the important benefits of connection load balancing and failover.

• Load Balancing of Connections to Oracle RAC Databases
  There are two types of load balancing that you can implement for an Oracle RAC database: client-side and server-side load balancing.
• Connection Failover for Oracle RAC Databases
  When a client issues a connection request using SCAN, the three SCAN addresses are returned to the client.
• Shared Server Configuration for an Oracle RAC Database
  Standalone Oracle databases perform load balancing by distributing connections among the shared server dispatcher processes.