Read e-book online Advances in Databases and Information Systems: Proceedings PDF

By Jānis Bārzdiņš, Ilona Etmane, Audris Kalniņš, Kārlis Podnieks (auth.), Dr. Prof. Johann Eder, Dr. of Sci., Prof. Leonid A. Kalinichenko (eds.)

This quantity effects from the general periods of the second one foreign Workshop of the Moscow ACM SIGMOD bankruptcy "Advances in Databases and knowledge structures" (ADBIS'95) that happened 27th-30th June 1995, in Moscow, Russia. ADBIS'95 maintains a sequence of annual Workshops on Advances in Databases and knowledge platforms prepared by way of the Moscow ACM SIGMOD bankruptcy in cooperation with the Russian Founda­ tion for easy learn. earlier profitable ADBIS meetings comprise the ADBIS'93 and ADBIS'94 Workshops that happened in Moscow. The goals of those workshops are to supply a discussion board for the presentation and in-depth dialogue of complex learn instructions that would successfully increase the construction and use of destiny details structures and to extend conversation among the jap and Western study groups that have been previously separated and now have basically infrequent percentages to have interaction. bettering of the contacts and alternate of rules among researchers from the East and from the West will ultimately result in larger collaboration among them. The ADBIS'95 demand Submissions attracted 60 submissions from 15 international locations of which 35 submissions have been accredited for presentation on the average periods, nine as posters, and seven as shows for a distinct consultation for the knowledge structures for technology. This quantity includes the papers awarded within the average sessions.

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Extra info for Advances in Databases and Information Systems: Proceedings of the Second International Workshop on Advances in Databases and Information Systems (ADBIS’95), Moscow, 27–30 June 1995

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During the wait phase a transaction waits for its chance to commit. If a conflict is detected with any higher priority transaction the lower priority transaction is not aborted immediately to avoid unnecessary aborts when the transaction which caused the abort is consecutively aborted due to another conflict. All updates are made permanent to the database during the write phase. If during the write phase of the lower priority transaction a conflict is detected with the higher priority one being in the read phase, the higher priority transaction is blocked.

9] J. R. Haritsa, M. J. Carey, and M. Livny. Data Access Scheduling in Firm Real-Time Database Systems. The Journal of Real- Time Systems, 4:203241,1992. [10] J. Huang, J. A. Stankovic, K. Ramamritham, and D. Towsley. Experimental Evaluation of Real-Time Optimistic Concurrency Control Schemes. In Proceedings of the 17th VLDB Conference, pages 35-46, September 1991. [11] W. Kim, J. Srivastava. Enhancing Real-Time DBMS Performance with Multiversion Data and Priority Based Disk Scheduling. In Proc of 12th IEEE Real- Time Systems Symposium, 1991.

In the OPT-SACRIFICE algorithm a validating transaction is restarted if it detects a conflict with any currently executing higher priority transaction. The algorithm suffers from the potential problem of wasted sacrifices. The OPT-WAIT algorithm uses a priority wait mechanism. The validation of a lower priority transaction is delayed if there is a conflict with higher priority transaction(s). The main disadvantage of the method is that the process of waiting increases the probability of new conflicts.

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