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MongoDB MCQs

In the MongoDB shell, how can you tell if an index was used with a query?

Db.customers.find({lastName: 'smith'}).explain()

Db.customers.find({lastName: 'smith'}).perf()

Db.customers.find({lastName: 'smith'}).plan()

Db.customers.find({lastName: 'smith'}).usedIndex()

Answer

Correct Answer: Db.customers.find({lastName: 'smith'}).explain()

Explanation:

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