This chapter shifts focus to data distribution and high availability. We will compare physical streaming replication (byte-for-byte copy) with logical replication (publish/subscribe at the row level). Students will explore replication slots, the walreceiver/walsender processes, and logical decoding plugins.

Outside Reading

• Official Docs: Chapter 27: High Availability, Load Balancing, and Replication.
• Official Docs: Chapter 49: Logical Decoding.
• GitHub Source: src/backend/replication/walsender.c and src/backend/replication/walreceiver.c. Read the network loop that streams the byte-for-byte replication.