Top 10 MongoDB interview questions and answers for 2024

Are you a job seeker looking for a MongoDB job? Or, are you a recruiter trying to find an adept MongoDB developer? Whatever be your quest, these top MongoDB interview questions will help you in one way or another.

Last updated on Nov 28, 2023

MongoDB finds use among a wide range of enterprises in various domains. MongoDB is mostly used by companies in the computer software business in the United States. MongoDB is hugely beneficial to companies with 10-50 employees and revenue ranging from $1 million to $10 million.

Whether you are a candidate actively looking for MongoDB jobs or a recruiter looking for MongoDB developers, the following list of MongoDB interview questions will be of great use for you.

MongoDB interview questions and answers


In MongoDB, what exactly is a collection?

A collection is a collection of documents. If a document is MongoDB's equivalent of a row in a relational database, then a collection is MongoDB's equivalent of a table. Collections contain dynamic schemas. This means that the papers contained within a single collection might be of any shape. It's worth noting that the values in the previous documents are not just of different types (string and integer), but they frequently have entirely different keys. In MongoDB, any document can be contributed to any collection.


What exactly is sharding in MongoDB?

Sharding is the process of storing data records across many devices. It is a MongoDB strategy to meet data growth demands. It refers to the horizontal division of material in a database or search engine. Each partition is known as a shard or database shard.


In MongoDB, how does replication work?

The practice of synchronizing data across several servers is known as replication. Replication protects the database against the loss of a single server. With several copies of data on separate database servers, replication in MongoDB provides redundancy and boosts data availability.


What factors should be considered in MongoDB’s schema development process?

While developing a schema, one must consider the following:

Create your schema according to user needs. If you use many objects together, combine them into a single document. Separate them if necessary. In the schema, perform sophisticated aggregation.


What is the composition of Objecld?

Objectld is composed of the following:

Timestamp Client machine ID Client process ID 3 byte incremented counter


What are indexes in MongoDB?

Indexes are special structures in MongoDB that hold a subset of the data set in an easy-to-search format. The index maintains the value of a given field or collection of fields, ordered by the value of the field provided in the index.


What are the multiple languages supported by MongoDB?

MongoDB officially supports the following languages: C, C++, C#, Java, Node.js, Perl, PHP, Python, Ruby, Scala, Go, and Erlang. We can use MongoDB with any of the languages mentioned above. There are several other community-supported drivers available, but MongoDB provides the ones described above.


What are the data models of MongoDB?

There are two types of data models in MongoDB. They are embedded and normalized data models. The structure of documents has an impact on data modeling. In MongoDB, related data can be incorporated into a single document structure (embedded data model). The relationship between data is stored through references from one document to another. It's known as the normalized data model.


What is a profiler's role in MongoDB?

MongoDB includes a database profiler that displays information about the performance of each database activity. You can use this profiler to discover queries (and write operations) that are taking longer than they should and use that information to determine when an index is required.


What is MongoDB's replication mechanism?

Replication is the technique of synchronizing data across many servers. It provides continuity and boosts data efficiency by storing multiple copies of data on different database servers. Replication safeguards the database against the loss of a single server.

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Wrapping up

The above list of MongoDB interview questions will help you in the technical part of your MongoDB interview preparation. These MongoDB interview questions will assist you in answering similar questions or generating new ones. However, a MongoDB interview would not just have technical MongoDB interview questions. Your MongoDB interview will also comprise questions regarding your soft skills. It’s important for the recruiter to find someone who fits the bill as a great talent and team player. Soft skills questions in your MongoDB interview can show the recruiter whether you are such a person.

Get in touch with Turing if you're a recruiter looking to hire from the top 1% of MongoDB developers. If you're an experienced MongoDB developer searching for a new opportunity, is a great place to start.

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