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Home / Interview Subjects / MongoDB
WithoutBook LIVE Mock Interviews MongoDB Related interview subjects: 24

Interview Questions and Answers

Know the top MongoDB interview questions and answers for freshers and experienced candidates to prepare for job interviews.

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The Best LIVE Mock Interview - You should go through before interview

Know the top MongoDB interview questions and answers for freshers and experienced candidates to prepare for job interviews.

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Ques 1

How can you achieve ACID properties in MongoDB?

MongoDB sacrifices ACID properties for performance and scalability. However, it supports multi-document transactions in recent versions to some extent.
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Ques 3

Explain the concept of covered queries in MongoDB.

Covered queries are queries where all the fields in the query are part of an index, and the index itself can fulfill the query requirements, avoiding the need to fetch data from the actual documents.
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Ques 4

What is the role of the `$lookup` stage in MongoDB aggregation?

The `$lookup` stage is used in MongoDB aggregation to perform a left outer join between documents from the source and target collections based on a specified condition.
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Ques 6

How does MongoDB handle transactions?

MongoDB supports multi-document transactions starting from version 4.0. Transactions allow you to perform multiple operations on one or more documents and ensure atomicity and consistency.
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Ques 7

What is the Aggregation Pipeline in MongoDB?

The Aggregation Pipeline is a framework in MongoDB for data aggregation. It allows you to process data and transform it using a sequence of stages, such as `$match`, `$group`, and `$project`.
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