JCL Requirements for the CXX Data Set

One of the large benefits of Simplify mode is that the CXX is opened and  processed in MUF with a few exceptions. With the commitment that MUF will always be used, update security to the CXX can be removed from all but a few DBA type users at a site. This will increase the safety of the CXX significantly.
datacom
The examples in this section provide the CXX data set for functions that always, or sometimes, require it. However, to simplify JCL and to provide additional protection of the CXX, a best practice is to always omit the JCL for the CXX if it is not creating the data set (DISP=NEW). Instead, use the DBSIDPR module assembled with the DBSYSID macro keyword DSN_XXX=, specifying a model data set name for the CXX, LXX, and FXX that allows DBUTLTY (and MUF) to dynamically allocate the CXX only when it is needed.
One of the large benefits of Simplify mode is that the CXX is opened and  processed in MUF with a few exceptions. With the commitment that MUF will always be used, update security to the CXX can be removed from all but a few DBA type users at a site. This will increase the safety of the CXX significantly.