AllGlobalSpaceV returns the space limits for a given database or user at the system level. That is, the databases and tables with the actual current space usage and maximum permissible space usage. The difference between this view and the corresponding AllSpaceV[X] is that this view returns global level information on space usages while AllSpaceV[X] provides space usage information at the AMP level.
You can use the DBC.ClearPeakDisk macro to reset PeakPerm, PeakSpool, PeakPersistentSpool, and PeakTemp.
AppProxyUser and TrustUserName
These columns are not returned in the X or VX views.