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

Using the __rest expansion directive

The __rest expansion directive allows mongod or mongos to start with additional directives, or an entire configuration block, from an external REST request. Using parameters supplied with the directive, the server will issue an HTTP GET request to the REST application programming interface (API) endpoint specified and will receive its configuration in turn. The advantage of this approach is that it enables the centralization of startup directives across a large distributed MongoDB system. 

An obvious disadvantage when making requests to remote resources is that it opens a potentially huge security vulnerability. Thus, at a minimum, requests to any remote endpoint must use HTTPS. In addition, operating system permissions must restrict read access of the configuration file containing the __rest expansion directive to only the mongod or mongos user.

Here is a summary of parameters needed in conjunction with the __rest expansion directive: