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

Writing to a sharded cluster

Assuming that your sharded cluster has been implemented as a series of replica sets, one per shard, writing data to a sharded cluster is no different than writing data to a replica set. Here are some considerations for insert, update, and delete operations:

  • Insert: When performing an insert operation, the sharded cluster balancer decides into which chunk to place the document, based on the shard key value of the document to be added.
  • Update: In the case of an update, bear in mind that you'll need to supply a query document in addition to the update document. Just as with a read operation, if you include the shard key in the query document, updates show improved performance. If you set the upsert argument to True, you must include a shard key in the update-document in order for the sharded cluster balancer to correctly place the inserted document.
  • Delete: Again, as with an update, you need to supply a query document. Include the shard key...