PostgreSQL 13: Don't let slots kill your primary

If max_slot_wal_keep_size is zero, which is the default value, then there’s no limit. I don’t recommend this, because it leads to failures when slots fill the disk.

PostgreSQL: Documentation: 17: 19.6. Replication

postgres-config update --config max_slot_wal_keep_size=2GB.

Documentation: 17: 26.2. Log-Shipping Standby Servers

Rename configuration parameter wal_keep_segments to wal_keep_size (Fujii Masao) ... Allow WAL storage for replication slots to be limited by max_slot_wal_keep_size (Kyotaro Horiguchi).

UGREEN NVMe Adapter, M.2 SSD M and M+B Key to NVMe PCIe 4.0 X4 ...

If the database parameter max_slot_wal_keep_size is set to a non default value, and the restart_lsn of a replication slot falls behind the current LSN by more than this size, the DMS task fails due to removal of required WAL files.