Cool Features of SQL Server 2014: Improved Cardinality Estimates

Kevin Kline

Published On: May 14, 2015

Categories: Execution Plans, T SQL, Query Plan Analysis, Statistics 0


COOL FEATURES OF SQL SERVER 2014: IMPROVED CARDINALITY ESTIMATES

With all the cheerleading and the steady drumbeat of new features being released to Azure, it's easy to lose track of the many cool and valuable new features released in the on-premises version of SQL Server. One of the crown jewels of SQL Server, the cardinality estimator (CE), underwent a large redesign for SQL Server 2014 to improve performance. Cardinality estimates are an extremely important part of query processing. In a nutshell, cardinality estimates are what the relation engine predicts for the number of rows affected by a given operation, including intermediate row sets like those created by filters, aggregations, joins and spool.

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Originally Posted May 14, 2015

Kevin (@kekline) serves as Principal Program Manager at SentryOne. He is a founder and former president of PASS and the author of popular IT books like SQL in a Nutshell. Kevin is a renowned database expert, software industry veteran, Microsoft SQL Server MVP, and long-time blogger at blogs.sentryone.com/author/kevinkline. As a noted leader in the SQL Server community, Kevin blogs about Microsoft Data Platform features and best practices, SQL Server trends, and professional development for data professionals.


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