What happens to logical replication after running pg_upgrade?

postgres drop replication slot
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A physical replication slot prevents a source DB instance from removing WAL data before it's consumed by all read replicas Each read replica has its own

By themselves, replication slots occupy very little disk space They just store tiny bit of metadata, including a pointer to a position in WAL

postgresql drop replication slot SELECT pg_drop_replication_slot FROM pg_replication_slots WHERE slot_name IN ; The replication slots can

postgres replication slot The slot state state=present implies the slot must be present in the system state=absent implies the groups must be revoked from target_roles