https://www.postgresscripts.com/tags/replication-slots/Recent content in Replication Slots on Postgres ScriptsHugo -- gohugo.ioenPostgresScripts.comThu, 10 Sep 2026 00:00:00 +0000https://www.postgresscripts.com/post/monitor-logical-replication-slot-stats-with-pg-stat-replication-slots/Thu, 10 Sep 2026 00:00:00 +0000https://www.postgresscripts.com/post/monitor-logical-replication-slot-stats-with-pg-stat-replication-slots/ <h2 id="monitor-logical-replication-slot-stats-with-pg_stat_replication_slots">Monitor Logical Replication Slot Stats with pg_stat_replication_slots</h2> <p>How full does a logical decoding worker's memory buffer get before PostgreSQL gives up holding a transaction in RAM and starts writing it to disk? <a href="https://www.postgresql.org/docs/current/monitoring-stats.html">pg_stat_replication_slots</a> answers that question per slot, in concrete numbers — spilled-transaction counts, spilled bytes, and the streamed alternative — without grepping WAL sender logs for a spill message that may never get written. It's a narrow view with a narrow job: reporting on the internal memory accounting of logical decoding, not the replay lag a standby is carrying.</p>