ed object and extension quantum. Extension quantum is parameter
of database, specified in constructor. Bitmap is extended to be able to map
additional space. If virtual space is exhausted and no more
bitmap pages can be allocated, then <code>OutOfMemory</code> error
is reported.<P>

Allocation memory using bitmap provides high locality of references
(objects are mostly allocated sequentially) and also minimizes
number of modified pages. Minimization of number of modified pages is
significant when commit ope