An execution plan is Oracle’s “play-by-play” for how it intends to run your SQL. The Optimizer chooses an approach (access paths, join methods, sorts, and so on) based on its best estimate of the work required.
This chapter is a deeper, more practical guide to reading EXPLAIN PLAN quickly. You will learn to spot the expensive step, form a hypothesis, and decide what to test next.
The chapter builds the skill in three passes. First, Fig. 4.1
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