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—In this paper, we have proposed speculative locking (SL) protocols to improve the performance of distributed database systems (DDBSs) by trading extra processing resources. In SL, a transaction releases the lock on the data object whenever it produces corresponding after-image during its execution. By accessing both before and after-images, the waiting(More)
In the literature, the properties of several interestingness measures have been analyzed and a framework has been proposed for selecting a right interestingness measure for extracting association rules. As rare association rules contain useful knowledge, researchers are making efforts to investigate efficient approaches to extract the same. In this paper,(More)
— In this paper we have proposed an improved approach to extract rare association rules. Rare association rules are the association rules containing rare items. Rare items are less frequent items. For extracting rare itemsets, the single minimum support (minsup) based approaches like Apriori approach suffer from " rare item problem " dilemma. At high minsup(More)
A read-only transaction (ROT) does not modify any data. The main issues regarding processing ROTs are correctness, data currency and performance. Two-phase Locking (2PL) protocol is widely used for concurrency control with serializabilty as correctness criteria. Even though 2PL processes ROTs correctly with no data currency related issues, the performance(More)
A read-only transaction (ROT) does not modify any data. Efforts are being made in the literature to improve the performance of ROTs without correct-ness and data currency issues. The widely used two-phase locking protocol (2PL) processes the transactions without any correctness and data currency issues. However, the performance of 2PL deteriorates with data(More)
A read-only transaction (ROT) does not modify any data. The main issues regarding processing of read-only transactions (ROTs) are correctness, data currency and performance. Even though the popular two-phase locking protocol processes ROTs correctly with no data currency related issues, its performance deteriorates with data contention. To improve the(More)
The Web harbors a large number of community structures. Early detection of community structures has many purposes such as reliable searching and selective advertising. In this paper we investigate the problem of extracting and relating the web community structures from a large collection of Web-pages by performing hyper-link analysis. The proposed algorithm(More)