00 updates, it will
reduce overhead of each commit and save database size.<P>


If your persistent object form tree or graph where all objects can be accessed by reference from the root object,
then once you will load root object in main memory and store reference to it in some variable, 
GC will never be able to collect any instance of loaded persistent object (because it will be accessible from
the root object). So when you application access more and more objects from the storage, 
at some moment of time