In this chapter, we learned about indexing. Starting from the underlying pinnings of an index and index internals, we explored different index types available in MongoDB and how we can use them. These are single-field, compound, multikey, as well as some special types such as text, hashed, TTL, partial, parse, unique, case-insensitive, and geospatial.

In the next part of the chapter, we learned about how to build and manage indexes using the shell, a basic part of administration and database management, even for NoSQL databases. Finally, we discussed how to improve our indexes, both at a high level, and also how we can use index intersection in practice to consolidate the number of our indexes.

In the next chapter, we will discuss how we can monitor our MongoDB cluster and keep consistent backups. We will also learn about how we can handle security in MongoDB.