- مبلغ: ۸۶,۰۰۰ تومان
- مبلغ: ۹۱,۰۰۰ تومان
This paper presents a practical concurrency control mechanism ~ ObjectLocking in OODBMS. Object-Locking can schedule transactions, each of them can be considered as a sequence of high level operations defined on classes. By the properties of parallelity and commutativity between high level operations, proper lock modes for each operation axe designed and the compatibility matrix is constructed. With these lock modes, phantoms are kept away from databases and a high degree of concurrency is achieved.