Paraccel Netezza (aka. Netezza Performance Server) Teradata Vertica Apache Cassandra, wide column store NoSQL database. Apache HBase MongoDB, document-oriented database. Couchbase Server Riak SAP HANA CUBRID See also Oracle Data Guard Oracle Active Data Guard Database scalability References External links Oracle RAC Documentation Oracle Real Application Clusters (official website from Oracle Corporation) A Step-By-Step Project Guide for Implementing Oracle RAC Oracle Real Application Clusters and Industry Trends in Cluster Parallelism and Availability Oracle software Cluster computing