We are trying to run a program which has some query.. , the program has to run for 20 times sequently, 15 programs runs successfully and after 15th iteration the program says "connection closed", then we tried to change the Processes, sessions and even after increaing these parameters there was no effect, then we change "JOB_QUEUE_PROCESSES" and immediately after chaging this parameter from "0" to "1" , all programs executed successfully without "connection closed error", my question is in what way this parameter affects the connetion??.