If you run change data capture (CDC) out of PostgreSQL with AWS DMS, one component quietly holds the fate of your source database in its hands: the logical replication slot. Understand how the write-ahead log and slots interact, and you understand why disks fill, why CDC stalls, and how to fix it. TL;DR The WAL … Continue reading WAL, Replication Slots & AWS DMS: A PostgreSQL Deep Dive →