derived_stat("object_name" | object_id, index_name | index_id, ["partition_name" | partition_id,] “statistic”)

“statistic” – the derived statistic to be returned. Available statistics are:
data page cluster ratio or dpcr – the data page cluster ratio for the object/index pair
index page cluster ratio or ipcr – the index page cluster ratio for the object/index pair
data row cluster ratio or drcr – the data row cluster ratio for the object/index pair
large io efficiency or lgio – the large I/O efficiency for the object/index pair
space utilization or sput – the space utilization for the object/index pair