Top 10 MongoDB Interview Questions and Answers for Freshers Section - 2

Top 10 MongoDB Interview Questions and Answers for Freshers Section - 2

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3 min read

MongoDB has emerged as one of the core skill sets for the MERN stack. As the database most suited for modern applications, MongoDB has made a name for itself. The Top 10 MongoDB Interview Questions and Answers for Freshers are covered in this article.

How does MongoDB share data?

In MongoDB, sharding divides data across multiple servers to increase the database system's scalability and performance. It entails sharing data among a cluster of nodes, each storing a portion of its total data.

How is the data stored in MongoDB?

BSON (Binary JSON), a format used by MongoDB for storing data, is a binary format that represents documents as a list of fields and values. The flexible schema model used by MongoDB allows for including various areas and structures in a collection of documents.

How does Mongo Shell work?

We can interact with MongoDB instances using the command line thanks to the JavaScript shell known as MongoDB Shell. Aside from other data operations-related commands, performing administrative tasks is very helpful. While setting up MongoDB on our computers, Mongo Shell was automatically installed.

How does replication work?

Replication is the procedure that maintains exact duplicates of our data on multiple servers and is always advised for any production server. Replication safeguards our database no matter what happens to the server or the data. MongoDB keeps a copy of the data for backup, reporting, disaster recovery purposes, and additional documents.

How does MongoDB's journaling function?

While journaling is taking place, write operations are saved in memory. Because the On-disk journal files are so reliable, journaling is common. Mongo DB has created a journal subdirectory inside the database path.

What in MongoDB is the Pretty method?

A query's results are formatted when displayed using the pretty() method. In order to display the results in an understandable manner, this method specifies the cursor object.

The command's syntax is as follows:

db.collection_name.find (<query_string>) .pretty()

What horizontal scaling in MongoDB?

In MongoDB, sharding is the method used to achieve horizontal scaling. The potential increase in data size may prevent one machine from being able to handle all read and write operations. Sharding enables horizontal scaling by incorporating more than one system to handle the data load. The load on a single machine is thus decreased as a result of the data being spread across numerous systems.

Describe vertical scaling?

In MongoDB, the process of enhancing a server's functionality involves adding more RAM, storage space, and processing power to handle data-intensive tasks. System maintenance may become challenging as a result of the process's low cost-effectiveness.

What is GridFS?

In accordance with the BSON document size limit of 16 MB, GridFS is a specification for storing and retrieving files. Here, GridFs divides them into multiple parts instead of storing them all in one document, and then stores each part in a different document.

What are primary and secondary replica sets in MongoDB?

In MongoDB, the primary replica, also known as the master node, employs a single master method that allows it to accept just one node operation at a time. Slave node is another name for a secondary replica. Only the nodes that originated from the Primary replica can be read by the Secondary replica of MongoDB.

Conclusion:

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