- SAP HANA is a column-oriented, in-memory database that promises performance gains of up to 100,000x over traditional databases and enables new real-time use cases. Its appliance model reduces costs by simplifying infrastructure requirements. However, it requires new extreme main memory hardware and has limitations for high availability, disaster recovery, and virtualization initially. - Oracle Exadata is an optimized hardware and software appliance for Oracle Database that scales to hundreds of terabytes. It provides fast performance through SSD caching and compression but does not have a true column-oriented architecture. Additional products like TimesTen and Essbase are needed for optimal OLAP support. - IBM DB2 with BLU extension provides query acceleration for OL