MongoDB Tutorial 0/120 lessons ~6 min read Lesson 67
Query Planner
The query planner picks an index for each query.
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Focus
2 guided sections
Practice signal
Concept-first lesson
Career prep
Foundation builder
Introduction
The query planner picks an index for each query. It evaluates candidate plans empirically (runs each for a few hundred ms) and caches the winner per query shape.
Syntax reference
js
db.users.find({ city: "NYC" }).explain();
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