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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 standard classes of the second one foreign Workshop of the Moscow ACM SIGMOD bankruptcy "Advances in Databases and knowledge structures" (ADBIS'95) that came about 27th-30th June 1995, in Moscow, Russia. ADBIS'95 maintains a sequence of annual Workshops on Advances in Databases and knowledge structures geared up through the Moscow ACM SIGMOD bankruptcy in cooperation with the Russian Founda­ tion for easy study. previous profitable ADBIS meetings comprise the ADBIS'93 and ADBIS'94 Workshops that came about in Moscow. The goals of those workshops are to supply a discussion board for the presentation and in-depth dialogue of complicated examine instructions that may successfully increase the development and use of destiny details structures and to extend conversation among the japanese and Western examine groups which have been previously separated and also have purely infrequent percentages to have interaction. bettering of the contacts and trade of principles 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 authorised for presentation on the normal periods, nine as posters, and seven as displays for a unique consultation for the data platforms for technology. This quantity includes the papers awarded within the typical 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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These protocols outperform the 2PL-HP algorithm. However, later investigations proposed several alternatives to two phase locking for real-time systems. One ofthis concepts is based on the optimistic approach. 3 Principle of Optimistic Concurrency Control Optimistic concurrency control methods, also known as validation methods, are based on the assumption that data access conflicts between concurrently executed transactions occur relatively rarely. The first optimistic algorithm was proposed by Kung and Robinson (the OCC algorithm) [12].

However, when transactions with different priorities arrive into the database system at various moments of time there is no possibility to freely change their execution order. The past execution history of transactions, their previous conflicts, have introduced limits concerning the execution order. To guarantee the correctness of a concurrent execution of transactions some conflicting transactions have to be blocked (even those with higher priorities) or aborted. The former solution is in clear contrast to the requirement of realtime scheduling (although used in some current real-time concurrency control protocols).

If the child transaction committs, its parent transaction can restart it, or ignore, or start the contingency subtransaction, or deside to abort. This model implies partial refusing from atomicity and durability. In the Sagas model [3] each transaction is divided into relatively independent steps, for each of these steps the compensating transaction is defined. A system must guarantee that either the whole Saga will be executed or all its steps already performed will be compensated, so the committed steps may be rolled back.

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