When a database or table is created, the allocated disk space is divided evenly among all AMPs. The TableSize view returns one row of usage information for each AMP in the Teradata Database (or for all AMPs if the SUM aggregate is used).
The X view references these additional tables:
CurrentPerm returns the permanent space (in bytes) currently used by the database or table. The CurrentPerm column value includes all AMPs unless a specific AMP is requested.
Use the DBC.ClearPeakDisk macro to reset the PeakPerm column.