Gunnar Morling • 11/30/2022

The Insatiable Postgres Replication Slot

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A technical deep dive into diagnosing unexpected Write-Ahead Log (WAL) growth and rapid disk space consumption in an idle Amazon RDS Postgres database. The article details how an inactive logical replication slot, created for a CDC demo with Apache Flink, caused ~18 GB/day of WAL retention. It includes steps to reproduce the issue, analyze relevant Postgres metrics, and identify the root cause.

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#postgresql #Replication Slots #Amazon Rds
The Insatiable Postgres Replication Slot

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