08 - Replication & High Availability

Why Replication?

Replication serves multiple purposes:

1. High Availability: If primary fails, replica takes over
2. Read Scaling: Distribute read load across replicas
3. Disaster Recovery: Geographic redundancy
4. Backups: Run backups without impacting primary
5. Analytics: Run reports on replica, not production

Types of Replication

1. Physical (Binary) Replication

Replicates the exact disk blocks from primary to replica.