Database High Availability Patterns

Calendar February 22, 2026
Databases
Intermediate, Advanced
Ha-Architecture, Failover-Management, Replication-Design, Disaster-Recovery-Planning
High-Availability, Replication, Patroni, Group-Replication, Failover, Rpo, Rto, Postgresql, Mysql, Multi-Master
Patroni, Etcd, Haproxy, Mysql-Router, Pg_autoctl, Keepalived

Database High Availability Patterns#

Every database HA decision starts with two numbers: RPO (Recovery Point Objective – how much data you can afford to lose) and RTO (Recovery Time Objective – how long the database can be unavailable). These numbers dictate the pattern, and each pattern carries specific operational tradeoffs.

Core Concepts#

RPO = 0 means zero data loss. Every committed transaction must survive a failure. This requires synchronous replication, which adds latency to every write.