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Numeric Array Storage
 
Unlike string arrays, numeric arrays have a fixed amount of data associated
with each element.  Therefore, the following information about numeric
arrays is equally applicable to arrays of fixed-length strings or arrays
of user-defined types, since they also have a fixed amount of data
associated with each element in the array.
 
A numeric array has two parts: an array descriptor and the numeric array
data itself. The array descriptor contains information about the array
including its type, dimensions, and the location of its data in memory.
Array descriptors are always stored in DGROUP. The data in a numeric array
may be stored entirely in DGROUP or entirely in the far heap.