Preface
How This Book Is Organized
This book is split up into six sections, covering development, administration, and deployment information.
Getting Started with MongoDB
In Chapter 1 we provide background about MongoDB: why it was created, the goals it is trying to accomplish, and why you might choose to use it for a project. We go into more detail in Chapter 2, which provides an introduction to the core concepts and vocabulary of MongoDB. Chapter 2 also provides a first look at working with MongoDB, getting you started with the database and the shell. The next two chapters cover the basic material that developers need to know to work with MongoDB. In Chapter 3, we describe how to perform those basic write operations, including how to do them with different levels of safety and speed. Chapter 4 explains how to find documents and create complex queries. This chapter also covers how to iterate through results and gives options for limiting, skipping, and sorting results.
Developing with MongoDB
Chapter 5 covers what indexing is and how to index your MongoDB collections. Chapter 6 explains how to use several special types of indexes and collections. Chapter 7 covers a number of techniques for aggregating data with MongoDB, including counting, finding distinct values, grouping documents, the aggregation framework, and using MapReduce. Finally, this section finishes with a chapter on designing your application: Chapter 8 goes over tips for writing an application that works well with MongoDB.
Replication
The replication section starts with Chapter 9, which gives you a quick way to set up a replica set locally and covers many of the available configuration options. Chapter 10 then covers the various concepts related to replication. Chapter 11 shows how replication interacts with your application and Chapter 12 covers the administrative aspects of running a replica set.
Sharding
The sharding section starts in Chapter 13 with a quick local setup. Chapter 14 then gives an overview of the components of the cluster and how to set them up. Chapter 15 has advice on choosing a shard key for a variety of application. Finally, Chapter 16 covers administering a sharded cluster.
Application Administration
The next two chapters cover many aspects of MongoDB administration from the perspective of your application. Chapter 17 discusses how to introspect what MongoDB is doing. Chapter 18 covers administrative tasks such as building indexes, and moving and compacting data. Chapter 19 explains how MongoDB stores data durably.
Server Administration
The final section is focused on server administration. Chapter 20 covers common options when starting and stopping MongoDB. Chapter 21 discusses what to look for and how to read stats when monitoring. Chapter 22 describes how to take and restore backups for each type of deployment. Finally, Chapter 23 discusses a number of system settings to keep in mind when deploying MongoDB.
Appendixes
Appendix A explains MongoDB’s versioning scheme and how to install it on Windows, OS X, and Linux. Appendix B details ow MongoDB works internally: its storage engine, data format, and wire protocol.
Conventions Used in This Book
The following typographical conventions are used in this book:
- Italic
Indicates new terms, URLs, email addresses, collection names, database names, filenames, and file extensions.
Constant widthUsed for program listings, as well as within paragraphs to refer to program elements such as variable or function names, command-line utilities, environment variables, statements, and keywords.
Constant width boldShows commands or other text that should be typed literally by the user.
Constant width italicShows text that should be replaced with user-supplied values or by values determined by context.
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Using Code Examples
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Acknowledgments
I would like to thank my tech reviewers, Adam Comerford, Eric Milke, and Greg Studer. You guys made this book immeasurably better (and more correct). Thank you, Ann Spencer, for being such a terrific editor and for helping me every step of the way. Thanks to all of my coworkers at 10gen for sharing your knowledge and advice on MongoDB as well as Eliot Horowitz and Dwight Merriman, for starting the MongoDB project. And thank you, Andrew, for all of your support and suggestions.