While I echo my colleagues' earlier comments on the Microsoft/FAST Search transaction, I also give Microsoft thumbs up for being the first of the major BI vendors to embrace alternative DBMS for BI. For a while now I've been predicting that alternative DBMS for BI will gain continually increasing momentum for the following reasons:
Traditional relational databases were designed from the ground up for transaction processing, not BI. Only in the last decade have they even begun to accommodate BI-style queries, and still play a constant balancing act between OLTP and OLAP optimization. Columnar databases, such as Vertica, Sybase IQ, KX, ParAccel, SAND Technology, InfoBright, are specifically designed and optimized for nothing but OLAP query processing. Their schemas are also much more flexible since it's as easy to drop, add, or update a column in a columnar database as it is to insert, change, or delete a row in a relational database.