MySQL's built-in replication is the foundation for building large, high-performance applications on top of MySQL using the "scale-out" architecture. MySQL replication enables DBAs to configure one or more server as replicas of another server - keeping the data synced with the master copy. This Percona eBook, "MySQL Replication," covers the following:
"How does MySQL Replication really work?"
"How to identify and cure MySQL replication slave lag"
"GTIDs in MySQL 5.6: New replication protocol; new ways to break replication” Download here (pdf)