On Optimistic Concurrency Control for Real-Time Database Systems
نویسندگان
چکیده
منابع مشابه
An Optimistic Concurrency Control Protocol for Real-Time Database Systems
Transactions in real-time database systems are associated with certain timing constraints derived either from temporal consistency requirements of data or from requirements imposed on system reaction time. Fundamental requirements of real-time database systems are timeliness, i.e., the ability to produce expected transaction results early or at the right time, and predictability, i.e., the abil...
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Real-time systems (RTSs) form an important class of computer systems. They are characterized by existence of timing requirements concerning task execution times, and processing data items which values and validity change in time. We observe the growing importance of RTS applications which is accompanied with both the increase of data volumes processed by the systems and the requirements concern...
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In a recent study, we have shown that in real-time database systems that discard late transactions, optimistic concurrency control outperforms locking. Although the optimistic algorithm used in that study, OPT-BC, did not factor in transaction deadlines in making data conflict resolution decisions, it still outperformed a deadline-cognizant locking algorithm. In this paper, we discuss why addin...
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The two-phase locking approach widely used for concurrency control in database systems have some inherent disadvantages such as deadlock and unpredictable blocking time. These appear to be serious problems with respect to real-time transaction processing , since in a real-time environment transactions need to meet their time constraints as well as their consistency requirements. Integrated with...
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Real-time database systems (RTDBS) have received growing attention in recent years. RTDBS is a database system where transactions have explicit timing constraints such as deadlines. The performance and the correctness of RTDBS are highly dependent on how well these deadlines can be met. Scheduling of transactions is driven by priority considerations rather than fairness considerations. Concurre...
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ژورنال
عنوان ژورنال: American Journal of Applied Sciences
سال: 2006
ISSN: 1546-9239
DOI: 10.3844/ajassp.2006.1706.1710