This guide for using Dataguard technology covers all areas of disaster recovery, standby databases, and automatic Oracle failover. The details of how Oracle10g's improved Dataguard provides a comprehensive solution for disaster recovery while keeping a low TCO are discussed. Descriptions of the concepts and architecture of standby databases as well as the implementation and management of Dataguard are provided. Tips for success in configuration and first-time implementation of Dataguard including the internal working of Dataguard Broker and Dataguard with Recovery Manager are revealed.