On Fri, May 6, 2016 at 6:39 AM, Francisco Olarte <folarte@peoplecall.com> wrote: >> (previous successful key value + number of failed inserts) >> It seems to me that intuitively the key should only increment on a >> successful insert, not just an insert statement being executed. For one, >> this unnecessarily reduces the keyspace available for the column. > > I suspect this is "working as designed". The same things happen if you > do a lot of inserts and then rollback a transaction. This is because > serial use sequences, which are not mean to generate exact correlative > values, but to a mean to generate unique keys with very high > concurrency. It is. There have been several -bugs threads on this already. e.g., the following two: http://www.postgresql.org/message-id/flat/CAM3SWZQMfR6Zfe3A0Nr4ddko8xZrijAuQQ=EcGjGeJSs2piAXA@mail.gmail.com#CAM3SWZQMfR6Zfe3A0Nr4ddko8xZrijAuQQ=EcGjGeJSs2piAXA@mail.gmail.com http://www.postgresql.org/message-id/flat/CAM3SWZS2jd1Ci2TR2bjBXqZgK3JdoFin9yGbC5TQdYdF12RBuA@mail.gmail.com#CAM3SWZS2jd1Ci2TR2bjBXqZgK3JdoFin9yGbC5TQdYdF12RBuA@mail.gmail.com -- Peter Geoghegan
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