Class Central is learner-supported. When you buy through links on our site, we may earn an affiliate commission.

YouTube

Think Like the Cardinality Estimator

PASS Data Community Summit via YouTube

Overview

Save Big on Coursera Plus. 7,000+ courses at $160 off. Limited Time Only!
Explore the intricacies of SQL Server's cardinality estimation process in this 58-minute conference talk from PASS Data Community Summit. Dive deep into how the query optimizer generates row estimates based on statistics, and learn to leverage this knowledge to write more efficient TSQL code. Discover the impact of cardinality estimation on query execution, including object access methods, physical join types, and data sorting. Examine various scenarios such as multiple predicates, range predicates, unknown variable values, and ascending order predicate values. Gain insights into histogram usage and out-of-range predicate values. Walk away with enhanced skills to analyze and optimize challenging query plans, equipped with a thorough understanding of cardinality estimation techniques and their effects on query performance.

Syllabus

Introduction
Housekeeping
Session Evolution
How to contact me
About the session
Definitions
Pred selectivity
Example
Density
Density Example
cardiology estimation
SQL estimation
Execution plan
Why Cardinality Matters
Effects of Cardinality
Murphys Law
DBCC Statistics
Histogram
Explanation
Versions
Compatibility Level
Updated Stats
Actual Execution Plan
Multiple Predicates
What Changed
Parameter sniffing
Unknowns
Ascending Key

Taught by

PASS Data Community Summit

Reviews

Start your review of Think Like the Cardinality Estimator

Never Stop Learning.

Get personalized course recommendations, track subjects and courses with reminders, and more.

Someone learning on their laptop while sitting on the floor.