During add, delete, modify, or alias command processing, the APPC/MVS administration utility updates the VSAM KSDS, but it updates in-storage profiles within only the APPC address space that runs on the same system as the utility. If other systems share a VSAM KSDS for TP profile or side information, those systems cannot detect the updates.

When TP profile or side information data sets are shared among systems, IBM® strongly recommends that you do not use the utility to update them. Damage might result if you use the utility to update a data set while systems are sharing it. (However, you can safely use the retrieve and key utility commands whether the data set is shared or is used by only one system.)

To safely update a data set that is shared among systems:

1. Copy the shared data set into another VSAM KSDS
2. Use the utility to update the copy
3. Make the copy available for use by doing the following on each system that shares the data set:
   1. Create an APPCPMxx parmlib member that names the updated data set
   2. Issue a SET command to activate the new parmlib member.