Replication

Database replication ensures redundancy, backup, and automatic failover. Replication occurs through groups of servers known as replica sets.

Replica Set Use and Operation

Consider these higher level introductions to replica sets:

• Replica Set Fundamental Concepts
• Replica Set Architectures and Deployment Patterns
• Replica Set Considerations and Behaviors for Applications and Development
  • Write Concern
  • Read Preference
• Replica Set Internals and Behaviors

The following document describes master-slave replication, which is deprecated. Use replica sets instead of master-slave in all new deployments.

• Master Slave Replication

For documentation of MongoDB’s operational segregation capabilities for replica set deployments see the Data Center Awareness

Replica Set Tutorials and Procedures

The following tutorials describe a number of common replica set maintenance and operational practices in greater detail.

• Replica Set Administration
  • Deploy a Replica Set
  • Convert a Standalone to a Replica Set
  • Add Members to a Replica Set
  • Remove Members from Replica Set
  • Replace a Replica Set Member
  • Adjust Priority for Replica Set Member
  • Resync a Member of a Replica Set
  • Deploy a Geographically Distributed Replica Set
  • Change the Size of the Oplog
  • Force a Member to Become Primary
  • Manage Chained Replication
  • Change Hostnames in a Replica Set
  • Troubleshoot Replica Sets
  • Add an Arbiter to Replica Set
  • Convert a Secondary to an Arbiter
  • Configure a Delayed Replica Set Member
  • Configure a Replica Set Member as Hidden
  • Configure a Non-Voting Replica Set Member
  • Prevent Replica Set Member from Becoming Primary
  • Configure a Secondary’s Sync Target
  • Configure Replica Set Tag Sets
  • Reconfigure a Replica Set with Unavailable Members

Replica Set Reference Material

Additionally, consider the following reference material for replica sets.

• Replica Set Configuration
• Replica Set Commands
• Replica Set Features and Version Compatibility

See also

/reference/command/replSetGetStatus and db.getReplicationInfo().

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