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You're reading from Learn MongoDB 4.x A guide to understanding MongoDB development and administration for NoSQL developers

Product type Paperback

Published in Sep 2020

Publisher Packt

ISBN-13 9781789619386

Length 610 pages

Edition 1st Edition

Tools

MongoDB

Concepts

Databases

Author (1):

Doug Bierer

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Table of Contents (22) Chapters

Preface

1. Section 1: Essentials

2. Introducing MongoDB 4.x FREE CHAPTER

3. Setting Up MongoDB 4.x

4. Essential MongoDB Administration Techniques

5. Section 2: Building a Database-Driven Web Application

6. Fundamentals of Database Design

7. Mission-Critical MongoDB Database Tasks

8. Using AJAX and REST to Build a Database-Driven Website

9. Section 3: Digging Deeper

10. Advanced MongoDB Database Design

11. Using Documents with Embedded Lists and Objects

12. Handling Complex Queries in MongoDB

13. Section 4: Replication, Sharding, and Security in a Financial Environment

14. Working with Complex Documents Across Collections

15. Administering MongoDB Security

16. Developing in a Secured Environment

17. Deploying a Replica Set

18. Replica Set Runtime Management and Development

19. Deploying a Sharded Cluster

20. Sharded Cluster Management and Development

21. Other Books You May Enjoy

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MMAPv1 storage engine

MMAPv1 (https://docs.mongodb.com/manual/storage/#mmapv1-storage-engine), the original MongoDB storage engine, has been deprecated in MongoDB 4.0 and removed as of MongoDB 4.2. It has been replaced by WiredTiger, which has been available since MongoDB version 3.0. WiredTiger has been the default since MongoDB version 3.2, so there is a good chance that this backward-incompatible change does not affect your applications nor installation.

If your installation was using the MMAPv1 storage engine before the upgrade, then you immediately notice more efficient memory and disk-space allocation. Simply put, MMAPv1 grabbed as much free memory as it could, and would allocate additional disk space with an insatiable appetite. This made a MongoDB 3 installation using MMAPv1 a bad neighbor on a server that is also doing other things!

Another difference that DevOps engineers appreciate is that embedded documents no longer continue to grow in size after being created. This...

You have been reading a chapter from

Learn MongoDB 4.x

Published in: Sep 2020

Publisher: Packt

ISBN-13: 9781789619386

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Authors (1)

Bierer

Doug Bierer has been hooked on computers since his first program, written on a DEC PDP-8, in 1971. In his wide-ranging career, he has been a professional contract programmer since 1978, having written applications in BASIC, PL/I, assembler, FORTH, C, C++, dBase/FoxBase/Clipper, Pascal, Perl, Java, and PHP. He deployed his first website in 1993 while living in San Francisco. He speaks four languages, has traveled extensively, and now resides in Thailand. He also spent some years doing system administration and TCP/IP networking. Some of his technical works include PHP 7 Programming Cookbook and Learning MongoDB 4.x (Packt), as well as Learning PHP and MySQL, Learning PHP Security and Learning Doctrine (O'Reilly Media).

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