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MongoDB Cookbook - Second Edition

MongoDB Cookbook - Second Edition

By : Dasadia, Nayak
5 (2)
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MongoDB Cookbook - Second Edition

MongoDB Cookbook - Second Edition

5 (2)
By: Dasadia, Nayak

Overview of this book

MongoDB is a high-performance and feature-rich NoSQL database that forms the backbone of the systems that power many different organizations – it’s easy to see why it’s the most popular NoSQL database on the market. Packed with many features that have become essential for many different types of software professionals and incredibly easy to use, this cookbook contains many solutions to the everyday challenges of MongoDB, as well as guidance on effective techniques to extend your skills and capabilities. This book starts with how to initialize the server in three different modes with various configurations. You will then be introduced to programming language drivers in both Java and Python. A new feature in MongoDB 3 is that you can connect to a single node using Python, set to make MongoDB even more popular with anyone working with Python. You will then learn a range of further topics including advanced query operations, monitoring and backup using MMS, as well as some very useful administration recipes including SCRAM-SHA-1 Authentication. Beyond that, you will also find recipes on cloud deployment, including guidance on how to work with Docker containers alongside MongoDB, integrating the database with Hadoop, and tips for improving developer productivity. Created as both an accessible tutorial and an easy to use resource, on hand whenever you need to solve a problem, MongoDB Cookbook will help you handle everything from administration to automation with MongoDB more effectively than ever before.
Table of Contents (12 chapters)
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11
Index

Understanding and analyzing oplogs


Oplog is a special collection and forms the backbone of the MongoDB replication. When any write operation or configuration changes are done on the replica set's primary, they are written to the oplog on the primary. All the secondary members then tail this collection to get the changes to be replicated. Tailing is synonymous to tail command in Unix and can only be done on a special type of collection called capped collection. Capped collections are fixed size collections which maintain the insertion order just like a queue. When the collection's allocated space becomes full, the oldest data is overwritten. If you are not aware of capped collections and what tailable cursors are, please refer to Creating and tailing a capped collection cursors in MongoDB in Chapter 5, Advanced Operations for more details.

Oplog is a capped collection present in the non-replicated database called local. In our previous recipe, we saw what a local database is and what collections...

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