I’ve been working on writing a new Microsoft white paper since January covering the main changes made in the SQL Server 2014 Cardinality Estimator, and happy to announce that it was just published:

Optimizing Your Query Plans with the SQL Server 2014 Cardinality Estimator

A big thanks to the contributor and reviewer team – including Yi Fang (Microsoft), Shep Sheppard (Microsoft), Mike Weiner (Microsoft), Paul White (SQL Kiwi Limited), Barbara Kess (Microsoft),  Jimmy May (Microsoft), Sanjay Mishra (Microsoft), Vassilis Papadimos (Microsoft) and Jack Li (Microsoft).  And thanks to Kathy MacDonald (Microsoft) for managing the whole process!