What are the best practices for indexing in MongoDB with Node.js?

What are the best practices for indexing in MongoDB with Node.js?

When indexing in MongoDB with Node.js, consider the following best practices: 1. Use the right index type (e.g., single field, compound, text). 2. Index fields that are frequently queried. 3. Avoid over-indexing, as it can slow down write operations. 4. Regularly analyze and optimize your indexes using the explain() method.

How do I create a compound index?

To create a compound index in MongoDB using Node.js, you can use the createIndex() method. For example:

const result = await collection.createIndex({ field1: 1, field2: -1 });

This creates an index on field1 in ascending order and field2 in descending order.

What is the impact of indexing on performance?

Indexing can significantly improve query performance by allowing MongoDB to quickly locate documents. However, it can also slow down write operations, as the index needs to be updated with each insert, update, or delete. It's essential to find a balance based on your application's read and write patterns.

Can you explain the difference between a unique index and a regular index?

A unique index ensures that the indexed fields do not have duplicate values, enforcing data integrity. A regular index, on the other hand, allows duplicate values. Use unique indexes for fields that must have unique values, like email addresses.