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MongoDB interview questions

MongoDB interview questions.

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  • 1.

    Explain what is MongoDB?

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  • 2.

    How many indexes does MongoDB create by default for a new collection?

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  • 3.

    Which are the most important features of MongoDB?

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  • 4.

    When should we embed one document within another in MongoDB?

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  • 5.

    Compare SQL databases and MongoDB at a high level

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  • 6.

    If you remove an object attribute, is it deleted from the database?

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  • 7.

    Does MongoDB need a lot space of Random Access Memory (RAM)?

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  • 8.

    Why does Profiler use in MongoDB?

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  • 9.

    What is “Namespace” in MongoDB?

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  • 10.

    What are Indexes in MongoDB?

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  • 11.

    What is BSON in MongoDB?

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  • 12.

    What is a replica set?

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  • 13.

    What Is Replication In MongoDB?

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  • 14.

    Mention the command to insert a document in a database called school and collection called persons.

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  • 15.

    Explain the structure of ObjectID in MongoDB

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  • 16.

    Why MongoDB is not preferred over a 32-bit system?

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  • 17.

    Does MongoDB pushes the writes to disk immediately or lazily?

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  • 18.

    When to use MongoDB or other document oriented database systems?

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  • 19.

    What is sharding?

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  • 20.

    What is use of capped collection in MongoDB?

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  • 21.

    What is the difference between MongoDB and MySQL?

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  • 22.

    Does Mongodb Support Foreign Key Constraints?

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  • 23.

    Why are MongoDB data files large in size?

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  • 24.

    What is the difference b/w MongoDB and CouchDB?

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  • 25.

    Can you create an index on an array field in MongoDB? If yes, what happens in this case?

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  • 26.

    If you remove a document from database, does MongoDB remove it from disk?

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  • 27.

    What is Sharding in MongoDB?

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  • 28.

    Should I normalize my data before storing it in MongoDB?

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  • 29.

    What does MongoDB not being ACID compliant really mean?

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  • 30.

    When to use CouchDB over MongoDB and vice versa?

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  • 31.

    How is MongoDB better than other SQL databases?

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  • 32.

    How can you achieve transaction and locking in MongoDB?

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  • 33.

    How can you achieve primary key - foreign key relationships in MongoDB?

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  • 34.

    What is oplog?

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  • 35.

    What is a covered query in MongoDB?

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  • 36.

    Is there an “upsert” option in the mongodb insert command?

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  • 37.

    Explain advantages of BSON over JSON in MongoDB?

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  • 38.

    Does MongoDB support ACID transaction management and locking functionalities?

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  • 39.

    How is data stored in MongoDB?

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  • 40.

    Can one MongoDB operation lock more than one databases? If yes, how?

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  • 41.

    What is Aggregation in MongoDB?

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  • 42.

    What is BSON and exactly how is it different from JSON?

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  • 43.

    What is a cluster in MongoDB?

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  • 44.

    Mention the command to check whether you are on the master server or not.

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  • 45.

    How can I combine data from multiple collections into one collection?

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  • 46.

    How do I perform the SQL JOIN equivalent in MongoDB?

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  • 47.

    How to query MongoDB with %like%?

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  • 48.

    Find objects between two dates MongoDB

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  • 49.

    How to query MongoDB with “like”?

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  • 50.

    What happens if an index does not fit into RAM?

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  • 51.

    Mention the command to list all the indexes on a particular collection

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  • 52.

    How can you isolate your cursors from intervening with the write operations?

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  • 53.

    Explain what is horizontal scalability?

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  • 54.

    How does MongoDB provide concurrency?

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  • 55.

    How does Journaling work in MongoDB?

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  • 56.

    Is MongoDB schema-less?

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  • 57.

    When to Redis or MongoDB?

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  • 58.

    How replication works in MongoDB?

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  • 59.

    What are alternatives to MongoDB?

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  • 60.

    Where can I run MongoDB?

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  • 61.

    At what interval does MongoDB write updates to the disk?

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  • 62.

    What are Primary and Secondary Replica sets?

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  • 63.

    Why is a covered query important?

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  • 64.

    Does MongoDB provide a facility to do text searches? How?

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  • 65.

    How does MongoDB ensure high availability?

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  • 66.

    What's the advantage of the backup features in Ops Manager versus traditional backup strategies?

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  • 67.

    Where does MongoDB stand in the CAP theorem?

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  • 68.

    Which are the two storage engines used by MongoDB?

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  • 69.

    What are three primary concerns when choosing a data management system?

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  • 70.

    How much faster is Redis than MongoDB?

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  • 71.

    What is a Storage Engine in MongoDB

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  • 72.

    What is splitting in MongoDB?

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  • 73.

    How to condense large volumes of data in Mongo?

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  • 74.

    What are the differences between MongoDB and MySQL?

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  • 75.

    Update MongoDB field using value of another field

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  • 76.

    How to check if a field contains a substring?

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  • 77.

    How to get the last N records from find?

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  • 78.

    MongoDB relationships. What to use - embed or reference?

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  • 79.

    How to remove a field completely from a MongoDB document?

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  • 80.

    By default, MongoDB writes and reads data from both primary and secondary replica sets. True or False.

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  • 81.

    How to find MongoDB records where array field is not empty?

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  • 82.

    Is it possible to update MongoDB field using value of another field?

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  • 83.

    How to find document with array that contains a specific value?

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