Read Scaling with Hot Standby and Load Balancing
Learn how to offload read traffic to streaming replica standbys, understand replication lag, and route queries between primary and replicas for horizontal read scaling.
Why Scale Reads?
A single primary can become a bottleneck when read-heavy traffic grows. By sending SELECTs to read replicas, you free the primary to handle writes and scale reads horizontally by adding more standbys.
Hot Standby Basics
A hot standby is a streaming replica that accepts read-only queries while it continuously applies changes received from the primary. It stays nearly in sync via the write-ahead log (WAL).
All lessons in this course
- Connection Pooling with PgBouncer
- Replication Strategies (Streaming, Logical)
- Sharding and Distributed PostgreSQL
- Read Scaling with Hot Standby and Load Balancing