Advanced Replication Guide : Updating and maintaining the schema of a distributed system : Upgrading the schema of a distributed system
  
Upgrading the schema of a distributed system
See also
Introduction to Maintenance Mode
Major features and functionality for upgrading the schema of a distributed system
Updating a distributed schema
Example: Upgrading a distributed schema
Considerations for using maintenance mode
Upgrading the server version
Updating and maintaining the schema of a distributed system