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Use Dynamic Arrays and Erase to Reclaim Memory
Consider using dynamic arrays instead of fixed arrays. When you no longer need the data in a dynamic array, use Erase or ReDim Preserve to discard unneeded data, and reclaim the memory used by the array. For example, you can reclaim the space used by a dynamic array with the following code:

Erase MyArray

Whereas Erase completely eliminates the array, ReDim Preserve makes the array smaller without losing its contents:

ReDim Preserve MyArray(10, smallernum)

Erasing a fixed-size array will not reclaim the memory for the array — it simply clears out the values of each element of the array . If each element was a string, or a Variant containing a string or array, then erasing the array would reclaim the memory from those strings or Variants, not the memory for the array itself.

(c) MSDN April 2001