Z/OS 1.8 introduced a change which allowed users the ability to prevent CSA storage from being acquired in a User Key Subpool(key 8-15).
A new VSM option is being added to the DIAGxx member of SYS1.PARMLIB which will either allow or prevent User Key storage to be GETMAIN'ed.
The default value for z/OS 1.8 is set to "YES" to allow User key Storage to be GETMAIN'ed, however the Default could change to "NO" in a future release of z/OS.
The format of the DIAGxx option is VSM ALLOWUSERKEYCSA(YES/NO) where YES allows User Key CSA to be allocated and NO to prevents User Key CSA from being obtained.
Is there any impact in DB2 Management tools by using z/OS parameter ALLOWUSERKEYCSA(YES/NO).
Using ALLOWUSERKEYCSA (YES/NO ) will have no impact on the Database Management Solutions for Db2 for z/OS tools.