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

What are some potential replica set benefits?

There are four primary benefits gained by deploying a replica set:

  • High availability: In an ideal scenario, data is available 24/7 (which is 24 hours a day, 7 days a week). Realistically, however, electrical power and network connections go down occasionally (depending on where you live, perhaps more often than not!). Also, of course, servers crash and there are hardware failures. If, however, your data is replicated on other servers, possibly located in different geographic areas, the probability of the data being completely unavailable is considerably reduced.
  • Data redundancy: Another aspect of a properly deployed replica set is that data is duplicated, thereby effectively providing a continuous online form of backup. Although it's still considered best practice to make regular offline backups, a properly designed replication strategy can help minimize the need to restore from a backup. The difference between data that is replicated...