Introduction › How EDIF Prevents Updates When Programs Extract Data Before Opening Data Sets

How EDIF Prevents Updates When Programs Extract Data Before Opening Data Sets

EDIF can prevent damage that occurs when a program extracts information before a data set is serialized and a second program updates that data set in the meantime. You can tell EDIF to detect and prevent this type of update. First, determine whether a program extracts information before issuing an OPEN request for a data set. If it does, then tell EDIF to check the JCL for the value DISP=OLD whenever that program tries to update a protected data set. If DISP=OLD is not specified, then EDIF records the update, prevents the update, or does both by abending the program.