What is true about indexes?

June 25, 2021 Team Pa 0 Comment

MongoDB LinkedIn Assessment Questions and Answers

They speed up read access while slowing down writes.
They secure the database from intruders.
They speed up reads and writes.
They speed up write access while slowing down reads.

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From the MongoDB shell, how do you create a new document in the customers collection?From the MongoDB shell, how do you create a new document in the customers collection?

db.customers.add({name: “Bob”}) db.customers.save({name: “Bob”}) db.customers.create({name: “Bob”}) db.customers.new({name: “Bob”})[...]

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You want to know how many types of items you have in each category. Which query does this?You want to know how many types of items you have in each category. Which query does this?

db.product.group({_id: “$category”, count: {$sum:1}}) db.product.aggregate($sum: {_id: “$category”, count: {$group:1}}) db.product.aggregate($group: {_id: “$category”, count: {$sum:1}}) db.product.aggregate($count: {_id: “$category”, count: {$group:1}})[...]

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Which programming language is used to write MongoDB queries? (Alternative: In the MongoDB shell, what programming language is used to make queries?)Which programming language is used to write MongoDB queries? (Alternative: In the MongoDB shell, what programming language is used to make queries?)

Python JavaScript SQL TypeScript[...]

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