scholarly journals Real-time Optimistic Concurrency Control based on Transaction Finish Degree

2005 ◽  
Vol 1 (4) ◽  
pp. 471-476 ◽  
Author(s):  
Han Qilong ◽  
Hao Zhongxiao
Keyword(s):  
Real Time ◽  
Concurrency Control ◽  
Optimistic Concurrency Control

Embedded Real-Time Database System Concurrency Control Protocol AC-Based OCC-FV

2012 ◽  
Vol 263-266 ◽  
pp. 1402-1406 ◽  
Author(s):  
Zhi Cheng Liu ◽  
Dong Sheng Lin ◽  
Yun Zhi Ning
Keyword(s):  
Real Time ◽  
Concurrency Control ◽  
The Body ◽  
Suitable Alternative ◽  
Optimistic Concurrency Control ◽  
Control Protocol ◽  
Safe State ◽  
Real Time Database ◽  
Basic Characteristics ◽  
Ready Queue

Alternative and compensation are not only two basic characteristics of the real-time transaction but also the body of the concurrency control. At the same time, new problems are brought. AC-Based OCC-FV protocol associates alternative and compensation with optimistic concurrency control protocol OCC-FV. For each transaction in accepted queue, an alternative which causes no conflict can be chosen to join the ready queue as soon as possible. This is just a kind of ideal circumstance. If the conflict is inevitable, it is necessary to choose a suitable alternative to join the concurrency control, but also ensures the system to be in a safe state when conflicts take place. In conflict resolution, the optimistic concurrency control protocol OCC-FV is extended in combination with the compensation characteristic, when the transaction failed, immediate dispatch of corresponding compensation transactions is taken to prevent the system from disaster.

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