Hi all , I wander which mode is better ? I know that the default in oracle is timestamp , which is more suitable for development where table structures are happing , but I production I'm under impression the using signature may reduce overhead in recompilation , especially when the code is related to partitions tables the maybe be change from time to time. What do you say ? If anyone has experience in when using signature ? Amihay Gonen DBA, 972-3-90021678