Book Image

Mastering MongoDB 6.x - Third Edition

By : Alex Giamas
Book Image

Mastering MongoDB 6.x - Third Edition

By: Alex Giamas

Overview of this book

MongoDB is a leading non-relational database. This book covers all the major features of MongoDB including the latest version 6. MongoDB 6.x adds many new features and expands on existing ones such as aggregation, indexing, replication, sharding and MongoDB Atlas tools. Some of the MongoDB Atlas tools that you will master include Atlas dedicated clusters and Serverless, Atlas Search, Charts, Realm Application Services/Sync, Compass, Cloud Manager and Data Lake. By getting hands-on working with code using realistic use cases, you will master the art of modeling, shaping and querying your data and become the MongoDB oracle for the business. You will focus on broadly used and niche areas such as optimizing queries, configuring large-scale clusters, configuring your cluster for high performance and availability and many more. Later, you will become proficient in auditing, monitoring, and securing your clusters using a structured and organized approach. By the end of this book, you will have grasped all the practical understanding needed to design, develop, administer and scale MongoDB-based database applications both on premises and on the cloud.
Table of Contents (22 chapters)
1
Part 1 – Basic MongoDB – Design Goals and Architecture
4
Part 2 – Querying Effectively
11
Part 3 – Administration and Data Management
16
Part 4 – Scaling and High Availability

Replication

There are different approaches to replication. The approach that MongoDB takes is logical replication with a primary-secondary, which we will explain in more detail later in this chapter.

Logical or physical replication

With replication, we synchronize data across multiple servers, providing data availability and redundancy. Even if we lose a server due to a hardware or software failure, by using replication, we will have multiple copies that we can use to restore our data. Another advantage of replication is that we can use one of the servers as a dedicated reporting, or backup, server. 

In logical replication, we have our primary server performing operations; the secondary server tails a queue of operations from the primary and applies the same operations in the same order. Using MongoDB as an example, the operations log (oplog) keeps track of operations that have happened on the primary server and applies them in the exact same order on the secondary...