I was looking at an application recently which was written in Java and used Postgresql as it DB. In it extensive use had been made of PreparedStatements both for SELECTs and for INSERT, UPDATE and DELETE statements. Some of the routines had multiple UPDATEs doing much the same thing but with slightly different parameters. In the comments it was stated that it was better to prepare lots of statements in advance rather than build one on the spot (and then prepare it, it needed the substitution) because of the optimiser. This set me thinking (always dangerous). I can see how a SELECT can be helped by preparing the statement, but not really how an INSERT could or, other than the SELECT implicit in the WHERE clause on an UPDATE or DELETE, how UPDATE or DELETE statements would be helped. Can anyone enlighten me please? David ---------------------------(end of broadcast)--------------------------- TIP 5: don't forget to increase your free space map settings
