May 2017
Beginner
416 pages
10h 37m
English
Content preview from Mastering PostgreSQL 9.6
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Applying transformations
Obviously, doing the obvious thing (joining the view first) makes no sense at all. A nested loop would send execution times through the roof. A hash join has to hash millions of rows and a nested loop has to sort 300 million rows. All three options are clearly not suitable here. The way out is to apply logical transformations to make the query fast. In this section, you will learn what the planner does to speedup the query. A couple of steps will be performed.
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