Five tips on Postgres logical decoding

Logical decoding is a mechanism in Postgres that enables users to stream changes as a sequence of logical operations. It's useful for applications that need to keep an external data store synchronized with Postgres, such as replicating data in Postgres to Data Warehouses for analytics. Monitoring slot activity and its growth can help detect if the consumer application is lagging or halted. Large transactions can lead to Slot growth, but this can be avoided by using the START_REPLICATION command. PUBLICATIONs can filter logical decoding changes based on specific tables, schemas, types of changes, and even column values. The logical_decoding_work_mem setting controls how much memory a logical replication connection can use to decode changes. Postgres 16 allows creating replication slots on standby, offering benefits like easing the load on the primary server and eliminating the risk of replicating slot growth impacting the primary.