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Sharding

MongoDB scales horizontally via an auto-sharding (partitioning) architecture. MongoDB sharding provides:

Automatic balancing for changes in load and data distribution
Easy addition of new machines without down time
Scaling to one thousand nodes
No single points of failure
Automatic failover

Getting Started

Introduction. Philosophy, use cases, and its core components.
Simple Initial Sharding Architecture
Configuration. Setting up your cluster.
Administration

Additional Info

Failover How failover/HA works.
Sharding Internals Implementation details.
Restrictions and Limitations
FAQ Frequently asked questions.
HOWTO
- Changing Config Servers

Presentations and Further Materials

How Sharding Works - O'Reilly Webcast (February 2011)
How queries work with sharding (PDF)
Illustration of chunks and migration (PDF) http://www.10gen.com/video/mongosf2011/sharding
Scaling MongoDB - O'Reilly ebook
Schema design at scale (video)
Mongo Sharding Architecture, Implementation, Internals (video)

See Also

Replication

Video - How and When to Scale MongoDB with Sharding

Presentation at MongoSV (December 2011)

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Added by Dwight Merriman, last edited by Meghan Gill on Dec 20, 2011 (view change)

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Changing Config Servers

flushRouterConfig command

Simple Initial Sharding Architecture

Sharding Introduction

Configuring Sharding

Upgrading from a Non-Sharded System

Sharding Administration

Sharding and Failover

Sharding Limits

Sharding Internals

Sharding FAQ

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