october, 2019
Abstract
Abstract
SQL Server must estimate the number of rows based on statistics to determine the physical operators, memory allocation and the degree of parallelism prior to query execution.
In this session (Level 300-400) you will learn the benefits and limitations of these statistics. I will explore the effects of missing and stale statistics, show the structure of statistics (header, density vector, histogram), and deal with query hints, such as optimizing for unknowns and using local variables.
Speaker for this event
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Torsten Strauß
Torsten Strauß
MVP | MCSE | MCT
Torsten (MVP, MCSE, MCT) has been working with Microsoft SQL Server since the turn of the millennium and is specialized in performance optimization for large SQL Server environments. He has been with bp as a database engineer for over two decades and collaborates closely with Sarpedon Quality Lab as a Principal Microsoft SQL Server Consultant. Torsten is the founder of inside-sqlserver.com and has given more than 120 presentations on Microsoft SQL Server performance optimization at national and international conferences and user groups. Torsten has been recognized as a Microsoft Most Valuable Professional for Data Platform since 2018.
MVP | MCSE | MCT
Time
(Saturday) 2:00 PM - 2:45 PM CEST
Venue
Pathé Leidsche Rijn
Pathé Leidsche Rijn, Berlijnplein 100, 3541 CM, Utrecht, Netherlands