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pg_receivexlog and pg_recvlogical error out when --create-slot is specified and a slot with the same name already exists. In some cases, especially with pg_receivexlog, that's rather annoying and requires additional scripting. Backpatch to 9.5 as slot control functions have newly been added to pg_receivexlog, and there doesn't seem much point leaving it in a less useful state. Discussion: 20150619144755.GG29350@alap3.anarazel.de