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If max_slot_wal_keep_size is -1 (the default), replication slots may retain an unlimited amount of WAL files. Otherwise, if restart_lsn of a replication slot ...
Supabase CLI config
To illustrate, assume max_wal_size is 1GB and max_slot_wal_keep_size is 5GB. As long as a slot’s WAL file requirement is within 1GB, it’s wal_status remains reserved.
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Summary We are using max_slot_wal_keep_size from Postgresql 13 to prevent master from being killed by a lagging replication.
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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.