TOPIC OVERVIEW

MongoDB/CRUD

Learn how MongoDB stores, finds, changes, and removes documents in a collection.

18 QuestionsBeginnerHigh Priority ~12 min read

CRUD stands for Create, Read, Update, and Delete — the four basic operations you perform on data. In MongoDB, data is stored as flexible JSON-like documents inside collections, and you use queries to find and modify those documents.

MongoDB gives you methods such as insertOne, find, updateOne, and deleteOne, along with many variations for handling multiple documents. Understanding filters, update operators, projections, and returned results is the foundation for working with MongoDB.

What you'll walk away knowing

How documents are created, read, updated, and deleted

How MongoDB filters find the documents you need

How update operators such as $set and $inc work

How to update or delete multiple documents safely

1What is the difference between replaceOne and updateOne with $set in terms of performance and BSON size?Intermediate 2What are the operational risks of running a deleteMany({}) on a collection with millions of records?Intermediate 3Explain the impact of an 'Upsert' on a high-write collection with multiple indexes.Advanced 4How does MongoDB handle Write Concern (w: 1 vs w: majority) and what are the latency trade-offs?Intermediate 5What is a 'Covered Query' and how do you design one using Projection?Intermediate 6How do we Insert or Update in a Single Operation?Intermediate 7How do we update arrays in the MongoDB documents?Intermediate 8How does the WiredTiger engine handle concurrency during a massive updateMany operation?Advanced 9How do we delete documents in a collection?Beginner 10You are scraping 1 million products per day using Puppeteer. If a product price changes, you need to update it, but if it's new, you must insert it. You also need to track the 'Last Seen' timestamp. How would you structure this CRUD operation to be most efficient?Intermediate 11How to read records in MongoDB via Node.js?Intermediate 12How to create/ insert a record in MongoDB via Node.js?Intermediate 13What is Query Selectors/Query Operators?Intermediate 14What is Projection Operators?Intermediate 15How do you update an element inside a deeply nested array using Array Filters (arrayFilters)?Intermediate 16How to Connect to MongoDB server from Node.js application?Intermediate 17Is data truly removed from the disk immediately after a delete?Intermediate 18How can we modify documents?Intermediate 19How would you handle a 'Bulk Write' failure mid-way through 10,000 documents?Advanced

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