In the database warehouse/BI/analytics space, there is a lot of talk about in-memory technology and how it improves performance. In his blog, Boris Evelson explains what specifically is in-memory for various products including SAP BI Accelerator, QlikView, TM1, and MicroStrategy. Worth a quick look: http://www.information-management.com/blogs/in_memory_analysis_query_reporting-10017593-1.html.
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