Building on the excellent storage usage introduced in DB2 for z/OS Version 8, DB2 9 for z/OS has made more significant storage improvements of its own by moving more of the environmental descriptor manager (EDM) cache areas above the 2 GB bar. In Version 8, the "old" EDM pool was broken into three parts, or three distinct caches. All DBDs are now stored in the DBD pool (EDMDBDC) above the 2GB bar
