Hi Sami >I am just curious to know what is this undocumented >init parameters mentioned below? >What is the difference between java_pool_size and __java_pool_size When automatic SGA management is switched on, Oracle uses the "double undocumented" parameters to save the "used" (tuned) values. In fact the regular parameters (e.g. java_pool_size) are used as minimal value for the pools. Regards, Chris