Book Image

MongoDB Administrator???s Guide

By : Cyrus Dasadia
Book Image

MongoDB Administrator???s Guide

By: Cyrus Dasadia

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. Packed with many features that have become essential for many different types of software professional and incredibly easy to use, this cookbook contains more than 100 recipes to address the everyday challenges of working with MongoDB. Starting with database configuration, you will understand the indexing aspects of MongoDB. The book also includes practical recipes on how you can optimize your database query performance, perform diagnostics, and query debugging. You will also learn how to implement the core administration tasks required for high-availability and scalability, achieved through replica sets and sharding, respectively. You will also implement server security concepts such as authentication, user management, role-based access models, and TLS configuration. You will also learn how to back up and recover your database efficiently and monitor server performance. By the end of this book, you will have all the information you need—along with tips, tricks, and best practices—to implement a high-performance MongoDB solution.
Table of Contents (17 chapters)
Title Page
Credits
About the Author
About the Reviewers
www.PacktPub.com
Customer Feedback
Preface

Creating a point in time backup of replica sets


MongoDB replica sets maintain operations log using a capped collection called oplog. The oplog is what is shared between the replica set nodes to maintain consistency. In this recipe, we will look at how to create point in time backups of replica sets using oplog.

Getting ready

You need a three node MongoDB replica set installation, preferably with some data in it. Refer to the recipes Initializing a new replica set, in Chapter 4, High Availability with Replication, for instructions on how to create a replica set, and Creating an index in Chapter 2, Understanding and Managing Indexes, for instructions on how to import sample data into a MongoDB instance.

How to do it...

  1. First, we connect to the primary replica set node and insert about 100,000 random documents:
for(var x=0; x<100000; x++){ db.mycol.insert({age:(Math.round(Math.random()*100)%20) }) }
  1. Immediately switch to a different Terminal and take the backup:
mongodump --oplog --out /backups...