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Learn MongoDB 4.x

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

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Product type Paperback
Published in Sep 2020
Publisher Packt
ISBN-13 9781789619386
Length 610 pages
Edition 1st Edition
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Author (1):
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Doug Bierer Doug Bierer
Author Profile Icon Doug Bierer
Doug Bierer
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Table of Contents (22) Chapters Close

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

Manually migrating a chunk

To manually migrate a chunk, use the following command:

db.adminCommand( { moveChunk : DB.COLLECTION, find : QUERY, to : TARGET } )

The parameters are summarized as follows:

  • DB.COLLECTION (string): This string represents the name of the database, and collection name, separated by a period.
  • QUERY (JSON): You can specify a JSON document that describes the shard key field/value key pair considered the lower bound of the chunk to be migrated.
  • TARGET (string): This is a string representing the shard server to which the chunk is moved.

The process of determining the best query document is identical to that described in the previous sub-section when determining a split point.

Use this command only if system performance is severely compromised. Be sure to stop the sharded cluster balancer before performing this action. It is considered a best practice to leave chunk migration to the sharded cluster balancer.

The last topic to cover is backup and restore...

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