Replication in MongoDB

In this unit, you learned how to:

• Define replication and high availability
• Identify the architecture of replication in MongoDB
• Identify how automatic failovers work
• Explain the purpose of the oplog
• Set read and write concerns
• Direct reads by using read preferences
• Deploy a three-member replica set
• Reconfigure a running replica set
• Add and remove members from a replica set

Resources

Use the following resources to learn more about Replication with MongoDB:

Lesson 1: Introduction to Replication

• Replication

Lesson 2: Replication in MongoDB

• Replication in MongoDB
• Replica Set Primary
• Replica Set Secondary Members

Lesson 3: Automatic Failover and Elections with MongoDB Deployments

• Replica Set Elections

Lesson 4: The MongoDB Operation Log

• Replica Set Oplog
• Check the Replication Lag

Lesson 5: Read and Write Concerns with MongoDB Deployments

• Write Concern
• Read Concern
• Read Preference

Lesson 6: Deploying a Replica Set in a MongoDB Deployment

• Deploy a Replica Set

Lesson 7: Configuring a Replica Set in a MongoDB Deployment

• db.hello()
• Adjust Priority for a Replica Set Member
• Configure Replica Set Tag Sets
• rs.conf()
• Add Members to a Replica Set
• Remove Members from a Replica Set
• rs.status()