March 2018
Intermediate to advanced
816 pages
19h 35m
English
Content preview from SQL Server 2017 Developer???s Guide
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Adaptive query processing in SQL Server 2017
SQL Server Query Optimizer performs a very good job in the generation of execution plans. However, due to query complexity, skewed data distribution, suboptimal database design and badly written code, it makes sometimes very bad cardinality estimations that lead to slow performing execution plans. Because of wrong estimations, it can choose inappropriate plan operators (for instance Nested Loop Join instead of Hash Join), or a query can get significantly more or less memory granted for the execution than it is required. Sometimes, it simply assumes a fixed cardinality of 100 or 1.
SQL Server 2017 introduces query processing improvements that will adapt optimization and address the aforementioned ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.