What are the best practices for indexing in MongoDB?

What are the best practices for indexing in MongoDB?

When indexing in MongoDB, consider the following best practices: 1. Use compound indexes for queries that filter on multiple fields. 2. Index fields that are frequently queried or sorted. 3. Avoid over-indexing, as it can slow down write operations. 4. Use the explain() method to analyze query performance.

Can you explain what a compound index is?

A compound index is an index on multiple fields within a document. It allows MongoDB to efficiently query documents based on multiple criteria, improving performance for complex queries.

How do I determine which fields to index?

To determine which fields to index, analyze your query patterns. Look for fields that are frequently used in filters, sorts, or as part of join operations. Use the MongoDB profiler to identify slow queries.

What is the impact of indexing on write performance?

Indexing can slow down write performance because each time a document is inserted, updated, or deleted, the indexes must also be updated. It's important to balance read and write performance based on your application's needs.