What is a MongoDB index and how does it work?

What is a MongoDB index and how does it work?

A MongoDB index is a data structure that improves the speed of data retrieval operations on a database. It works by creating a sorted representation of the data, allowing the database to find and access records more efficiently.

What are the benefits of using indexes in MongoDB?

Indexes can significantly improve query performance, reduce the amount of data scanned, and enhance the overall efficiency of data retrieval.

Are there any downsides to using indexes?

Yes, while indexes speed up read operations, they can slow down write operations because the index must be updated whenever data is added, modified, or deleted.

How do I create an index in MongoDB?

You can create an index using the createIndex() method in MongoDB. For example: db.collection.createIndex({ fieldName: 1 }) for an ascending index.

Can I create a compound index?

Yes, you can create a compound index on multiple fields by passing an object with multiple key-value pairs to the createIndex() method.