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)
1
Section 1: Essentials
5
Section 2: Building a Database-Driven Web Application
9
Section 3: Digging Deeper
13
Section 4: Replication, Sharding, and Security in a Financial Environment
14
Working with Complex Documents Across Collections

Assigning ranges to zones

To assign ranges to zones, from a mongo shell connected to a mongos instance, use the sh.updateZoneKeyRange() helper method. The generic syntax for the shell helper method is as follows:

sh.updateZoneKeyRange(DB.COLLECTION, MIN, MAX, ZONE);

The arguments are summarized here:

  • DB.COLLECTION (string): This string represents the name of the database, and collection name, separated by a period.
  • MIN (JavaScript Object Notation (JSON)): You can specify a JSON document that describes the shard key field/value key pair considered the lower bound of the range. This value is inclusive—that is to say: greater than or equal to. If the shard key contains multiple fields, you can include some or all of the fields in the MIN document, as long as you always include the prefix.
  • MAX (JSON): You can specify a JSON document that describes the shard key field/value key pair considered the upper bound of...