Andrew Anderson <forumwriter007@xxxxxxxxx> writes: >> What's using it? > As I think, streaming replication is using this slot. Does anybody know how > to fix it ? Unless you need another replica that's downstream of the standby, you should not be maintaining a replication slot on the standby. There may be a way to have a slot that's not actually holding back WAL cleanup while doing nothing, but I don't know what it is. regards, tom lane