Technologies Coding Problems Bookmarks Learning Paths

Technologies Coding Problems Bookmarks Learning Paths

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Questions

1 of 12

1What are databases in mongoDB?

2What is MongoDB? List main features.

3List advantages and disadvantages of NosSQL and RDBMS.

4What is the difference between MongoDB Server and MongoDB Database?

5How does MongoDB ensures high availability?

6What is the BSON format?

7What is a collection in NoSQL database?

8What is a dcoument in NoSQL database?

9When to use RDBMS and when to use NoSQL DB in your applications?

10How is the json that we submit to mongoDB is converted to bson?

11How to connect to mongoDB database using in node js?

12Discuss what is NOSQL?

MongoDB

Bulk Operations

01 / 12

What are databases in mongoDB?

Difficulty: 5/10

Database namespace, Data isolation, Multi-database usage

In MongoDB, a database is a container that holds collections of documents. It serves as the top-level structure for organizing data in MongoDB, similar to a database in a relational database management system (RDBMS).

Scenario Questions

0-2 years experience

1You need to add a new feature that stores user profiles separately from logs. How would you decide whether to put them in the same MongoDB database or create a second database?
2If a developer runs `db.dropDatabase()` by mistake in a development environment, what immediate steps would you take to recover the data?

2-5 years experience

1During a rollout, you notice that reads from the 'analytics' database are slower than expected while the 'app' database is fine. What could cause this discrepancy and how would you troubleshoot it?
2Your team wants to enforce different read/write permissions for two databases on the same cluster. How would you configure roles and what trade‑offs should you consider?

5-8 years experience

1You are designing a multi‑tenant SaaS platform on MongoDB. Explain how you would use databases versus collections to isolate tenant data, and discuss the performance and operational implications of each approach.
2A sudden spike in traffic causes one database to hit its storage quota while others remain underutilized. How would you redesign the deployment to handle uneven growth without downtime?

8+ years experience

1Your organization plans to migrate from a monolithic MongoDB deployment with many databases to a sharded cluster. Outline the migration strategy, focusing on database‑level considerations, data consistency, and impact on existing applications.
2When evaluating long‑term governance, how would you decide on a naming convention and lifecycle policy for databases across multiple product lines to balance security, cost, and operational simplicity?

Follow-up Questions

How does MongoDB enforce isolation between databases on the same server?
What happens if you exceed the storage limit of a single database?
Can you have collections with the same name in different databases? How does that affect queries?

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What are databases in mongoDB? | Basics | MongoDB Interview Questions | NextRound.in