Adaptive Schemes

PS - Unit of data shipping and cache management is a page.
x - Concurrency control granularity.
y - Call back granularity.

• PS - OO : Object Locking, Object Callback.
• PS - OA : Object Locking, Adaptive Callback.
• PS - AA : Adaptive Locking, Adaptive Callback.

Note : Objects in a page may be marked invalid.