Query Tuning Fundamentals: Density, Predicates, Selectivity, and Cardinality
Summary from post
- Density - Measure of how often duplicates would occur
- Predicates - Join columns / filter clauses
- Cardinality - Number of rows returned by query operator
Turning a Scan into a Seek With A Pointless Predicate
Thanks to authors of the post. This post is a good reference for me.
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Very Good Reads!!
1 comment:
Looking at the opening image of the video - I'd refine slightly - and say the troubleshooting steps are :
1)Identify existing Problem
2)Monitor and define cause (root) of problem
3)Apply changes to problem
4)Problem Solved
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