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)

What is the use case for a replica set?

MongoDB offers most of the advantages for using a replica set and then some more:

  • Protecting from data loss
  • High availability of data
  • Disaster recovery
  • Avoiding downtime for maintenance
  • Scaling reads since we can read from multiple servers
  • Helping design for geographically dispersed services
  • Data privacy

The most notable item missing from the list in the introduction to our chapter is scaling writes. This is because in MongoDB, we can only have one primary and only this primary can take writes from our application server.

When we want to scale write performance, we typically design and implement sharding, which is the topic of the next chapter.

Two interesting properties of the way MongoDB replication is implemented are geographically dispersed services and data privacy.

It is not uncommon for our application servers to be located in multiple...