The Oracle Exadata Database Machine is engineered to be the highest performing and most available platform for running the Oracle Database. Oracle Exadata runs all types of database workloads including Online Transaction Processing (OLTP), Data Warehousing (DW) and consolidation of mixed workloads. Simple and fast to implement, the Oracle Exadata Database Machine powers and protects your most important databases and is the ideal foundation for a consolidated database cloud.
http://www.oracle.com/us/products/database/exadata/overview/index.html