Database management systems notes
Reading a Query Plan
EXPLAIN line by line, and the four shapes that mean something is wrong. Every section is a drawn page beside a clear written explanation, about 20 minutes in all.
- Chapter 25 of 34
- About 20 minutes
- 7 sections
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In this chapter
- The anatomy of one line
- Reading the tree
- The options worth using
- Shape 1: the estimate that is wildly wrong
- Shapes 2, 3 and 4
- A worked diagnosis
- A method for any slow query
Next chapters
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