When we talk to Data Warehouse customers – they often raise questions about the star joins improvements SQL Server 2008. Star join is a set of optimizations that provide some interesting performance gains in data warehouse workload. Instead of digging into details here on SQL CAT we want to draw your attention to this nice whitepaper about the subject: Happy reading. 
Read the complete post at http://blogs.msdn.com/sqlcat/archive/2009/12/16/whitepaper-about-star-join-optimizations.aspx
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