"Andres" <andres1981@xxxxxxxxx> writes: > I did this simple test and it fails too. > BEGIN (first transaction) > INSERT INTO mytable VALUES(1); > On other client > BEGIN (second transaction) > INSERT INTO mytable VALUES(0); > INSERT INTO mytable VALUES(1); > and it freezes waiting for the first o commit or rollback Not too surprising if the second insert would imply a unique-key violation. It has to wait to see if the first insertion of "1" is going to commit or not. regards, tom lane ---------------------------(end of broadcast)--------------------------- TIP 9: the planner will ignore your desire to choose an index scan if your joining column's datatypes do not match