A Computed Column Defined with a User-Defined Function Might Impact Query Performance

Author: Kun Cheng Reviewers: Shaun Tinline-Jones, Silvano Coriani, Steve Howard, Thomas Kejser, Sanjay Mishra A computed column is computed from an expression that can use other columns in the same table. The expression can be a noncomputed column name, constant, function, and any combination of these connected by one or more operators, but the expression… Read more

Writing New Hash Functions for SQL Server

Author: Thomas Kejser Contributors/Reviewers: Alexei Khalyako, Jerome Halmans, Fabricio Voznika, Sedat Yogurtcuoglu, Mike Ruthruff, Tobias Ternstrom and Steve Howard In this blog, I will explore ideas for extending SQL Server with new, fast hash functions. As will be shown, the high speed, built in functions CHECKSUM and BINARY_CHECKSUM are not always optimal hash functions, when… Read more

What’s so BIG about “Big Data”?

As announced during the PASS Summit 2011 Day One Keynote, we are diving deeper into the world of Big Data by embracing and contributing to the open source community and Hadoop. We’ve had a lot of good coverage on this topic with some examples below. Microsoft Expands Data Platform With SQL Server 2012, New Investments… Read more