Book Image

Learn MongoDB 4.x

By : Doug Bierer
Book Image

Learn MongoDB 4.x

By: Doug Bierer

Overview of this book

When it comes to managing a high volume of unstructured and non-relational datasets, MongoDB is the defacto database management system (DBMS) for DBAs and data architects. This updated book includes the latest release and covers every feature in MongoDB 4.x, while helping you get hands-on with building a MongoDB database app. You’ll get to grips with MongoDB 4.x concepts such as indexes, database design, data modeling, authentication, and aggregation. As you progress, you’ll cover tasks such as performing routine operations when developing a dynamic database-driven website. Using examples, you’ll learn how to work with queries and regular database operations. The book will not only guide you through design and implementation, but also help you monitor operations to achieve optimal performance and secure your MongoDB database systems. You’ll also be introduced to advanced techniques such as aggregation, map-reduce, complex queries, and generating ad hoc financial reports on the fly. Later, the book shows you how to work with multiple collections as well as embedded arrays and documents, before finally exploring key topics such as replication, sharding, and security using practical examples. By the end of this book, you’ll be well-versed with MongoDB 4.x and be able to perform development and administrative tasks associated with this NoSQL database.
Table of Contents (22 chapters)
Section 1: Essentials
Section 2: Building a Database-Driven Web Application
Section 3: Digging Deeper
Section 4: Replication, Sharding, and Security in a Financial Environment
Working with Complex Documents Across Collections

Creating a database user with read rights

When an application conducts queries only, there is no need to write anything to the database. Accordingly, we need to find a privilege action (that is, right) allowing a user to read from the database. The most likely right would be find. This right allows us to run the pymongo.collection.find() and pymongo.collection.aggregate() methods. This is perfect for an application that only needs to return the results of a query.

We do not assign this right directly to a user, however; instead, we select a role that includes this right, and assign the role to a database user. With this in mind, we will now consider the read built-in role. This role includes the find action privilege (or right), and also allows related operations, such as the ability to list collections and manage cursors (for example, the results of a query).

The database found in the Docker container used for this book is not secured in order to facilitate exercises in earlier...