Siebel Installation Guide for UNIX: Servers, Mobile Web Clients, Tools > Configuring the RDBMS > Configuring Oracle for Siebel Applications >
Guidelines for Using Real Application Clusters for Oracle
Siebel applications support Real Application Clusters (RAC) failover configurations for an Oracle database. Both Active/Passive and Active/Active RAC are supported.
NOTE: Siebel deployments using Siebel Remote can use Active/Passive RAC. Siebel deployments that do not use Siebel Remote can use either Active/Passive or Active/Active RAC.
For more information, see FAQ 2220 on Siebel SupportWeb, System Requirements and Supported Platforms on Siebel SupportWeb, and Oracle documentation Real Application Clusters Concepts.