MongoDB TutorialLesson 22Free preview

MongoDB Indexing/Search

This lesson is part of MongoDB · All levels

Summary

This lesson describes indexing as a way to speed up searches in MongoDB. Without an index, each query uses a collection scan that checks all documents; the index stores the data structure so that the search goes straight to its location. The index is created with createIndex() and its effectiveness can be monitored via the explain() command.

Key points

Index makes searches much faster than collection scans.
Db.koleksi.createIndex({ field: 1 }) makes the index go up, -1 goes down
_id is always automatically indexed by MongoDB
Too many indexes slow down the writing operation; explain() helps analyze

Full lesson

Code examples and quizzes

Full lessons, code examples, and quizzes are available to subscribers. 5 questions.