Database management systems notes
From SQL to a Plan
Parsing, rewriting, plan generation and costing, the four stages before anything runs. Every section is a drawn page beside a clear written explanation, about 19 minutes in all.
- Chapter 23 of 34
- About 19 minutes
- 6 sections
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In this chapter
- The four stages
- Rewrites that are always safe
- The cost model
- Cardinality estimation, and why it fails
- Searching for a join order
- Planning is not free
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