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The concurrency control problem in database systems has been examined by many people and several concurrency control algorithms have been proposed. The most popular algorithms are two-phase locking and timestamp ordering. Due to its inefficiency in some situations, we propose the optimized method which is combined of timestamp ordering and optimistic method. With this method, the efficiency can be improved in those systems where the conflicts between transactions rarely happen.  相似文献   
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时间序列的快速相似性搜索改进算法   总被引:1,自引:0,他引:1  
This paper introduces a new method for finding all subsequences similar to a given time series sequence.The method takes into account noise ,offset translation and amplitude scaling. Based on a piecewise linear representa-tion, the speed is exceptionally fast.  相似文献   
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