In the past, a Data Warehouse was used primarily in back-office business processes. By contrast, an Active Data Warehouse (ADW) is an operational system used during interactions with customers, suppliers, employees, and business partners. As a result, requirements for higher levels of availability are emerging for the ADW. An ADW built with Teradata Servers and the Teradata Database offers levels of data availability expected in a world-class operational system. The clique architecture provides fast recovery from single node failure scenarios. An ADW with Fallback enabled provides recovery from pathological failure scenarios, such as the complete failure of RAID devices, disconnection of I/O cables, various software errors, and more. Fallback achieves levels of single system availability unmatched by other RDBMS vendors.