The method I presented is the table size in Oracle blocks -- that would exclude all empty blocks below the HWM. IMHO, I would consider any block that contains the pointer or the actual migrated/chained rows as non-empty data blocks.
Originally Posted by davey23uk
so hows is a COUNT = to a SUM
you query wil return the number of rows?
Sorry for my poor usage. SUM in this context is the result of the query presented not the function SUM in oracle.