Details

You’re My Density: Making Sense of Statistics

Speaker: Erin Stellato

Duration: 60 minutes

Track: Room 321

The Query Optimizer uses statistics to decide how to execute a query. If statistics are out of date, improperly sampled or simply don’t exist, then you could unintentionally deceive the Optimizer. Accurate statistics can help avoid poor query plans, so if you’re not familiar with how to read a histogram, the various options for updating statistics or want to know why sample size does matter, this session is for you! We will also delve into what happens when a value doesn’t exist in a statistic, discuss methods to manage statistics for volatile tables and examine the challenges that exist with statistics on partitioned tables. Expect a session filled with demos and real-world examples that will create a foundation of statistics knowledge.


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