| 摘要 |
PURPOSE: A copy based concurrency control method is provided to offer a CMXAL(Classified Mobile Transactions over Extended Altruistic Locking) model by reconstructing a heterogeneous locking method according to a wireless environment in order to enhance a linearity of a transaction and an efficiency of a concurrency control. CONSTITUTION: In a case that a mobile host requests a fixed host to process a transaction and a requested object is not locked, a corresponding transaction locks the object and uses it. But if the requested object is locked and being used by other transaction, it is checked whether the used object is a given object or a read only object. If the used object is a given object, an object manager accepts the transaction process request. But if the used object is a read only object, it is checked whether the request is a read only or a read/write for the object. In a case of a read only request, the object can be shared, and in a case of a read/write request, the object is copied, a conventional read only transaction is allotted and the request transaction occupies the object.
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