Book Image

Mastering MongoDB 3.x

By : Alex Giamas
Book Image

Mastering MongoDB 3.x

By: Alex Giamas

Overview of this book

MongoDB has grown to become the de facto NoSQL database with millions of users—from small startups to Fortune 500 companies. Addressing the limitations of SQL schema-based databases, MongoDB pioneered a shift of focus for DevOps and offered sharding and replication maintainable by DevOps teams. The book is based on MongoDB 3.x and covers topics ranging from database querying using the shell, built in drivers, and popular ODM mappers to more advanced topics such as sharding, high availability, and integration with big data sources. You will get an overview of MongoDB and how to play to its strengths, with relevant use cases. After that, you will learn how to query MongoDB effectively and make use of indexes as much as possible. The next part deals with the administration of MongoDB installations on-premise or in the cloud. We deal with database internals in the next section, explaining storage systems and how they can affect performance. The last section of this book deals with replication and MongoDB scaling, along with integration with heterogeneous data sources. By the end this book, you will be equipped with all the required industry skills and knowledge to become a certified MongoDB developer and administrator.
Table of Contents (13 chapters)


There are different approaches to replication. The approach MongoDB takes is logical replication with a master-slave, which we will explain in more detail further on in this chapter.

Logical or physical replication

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

Logical replication is useful for a wide array of applications such as information sharing, data analysis...