> Memory objects are much more flexible than data spaces. Data spaces are
> limited to 2GB. Memory objects are only limited by the auxiliary 
storage.
> Memory objects can be guarded and can also be page protected. Data 
spaces
> cannot. Code can execute in memory object but not in data spaces. I 
started
> using memory objects 10 years ago and have nearly forgotten how to use a
> data space. 

  Guard pages and protected pages can be created in data spaces
using IARV64  with TAGET_VIEW=HIDDEN  and TARGET_VIEW=READONLY

Jim Mulder   z/OS System Test   IBM Corp.  Poughkeepsie,  NY

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