In this chapter, you learned about the foundations of indexing and index internals. We then explored how to use the different index types available in MongoDB, such as single field, compound, and 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, you learned how to build and manage indexes using the shell, which is a basic part of administration and database management, even for NoSQL databases. Finally, we discussed how to improve our indexes, at a high level, and also how we can use index intersection in practice, in order to consolidate the number of indexes.

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