Mastering Postgres Replication Slots: Preventing WAL Bloat and Other Production Issues
Over the last couple of years, I’ve helped dozens of users and organizations to build Change Data Capture (CDC) pipelines for their Postgres databases. A key concern in that process is setting up and managing replication slots, which are Postgres' mechanism for making sure that any segments of the write-ahead log (WAL) of the database are kept around until they have been processed by registered replication consumers.
When not being careful, a replication slot may cause unduly large amounts…
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