Active and Real-Time Database Systems (ARTDB-95): by Umeshwar Dayal (auth.), Mikael Berndtsson MSc, Jörgen

By Umeshwar Dayal (auth.), Mikael Berndtsson MSc, Jörgen Hansson MSc (eds.)

The parts of lively and real-time databases have obvious an important development of curiosity some time past few years, relatively with reference to their aid of time-critical and embedded purposes. ARTDB-95 supplied, for this reason, an incredible discussion board for researchers from either groups to debate study effects, and likewise to chart new instructions for the long run. in addition to the eleven submitted papers awarded on the workshop, this quantity additionally comprises four invited papers at the following themes: the effect of lively databases on advertisement perform; the optimization of energetic database transactions; the necessity for larger language, compiler and power aid for real-time databases; and the foundation of time constraints linked to facts, occasions and activities. jointly the papers supply a entire evaluate of present learn, and should offer priceless studying for educational and business researchers and scholars at either undergraduate and postgraduate level.

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Qian and G. Wiederhold. Incremental Recomputation of Active Relational Expressions. IEEE Transactions on Knowledge and Data Engineering, vol 3, num 3, pages 337-341, September 1991. -W. Wang and E. N. Hanson. A Performance Comparison of the Rete and TREAT Algorithms for Testing Database Rule Conditions. In Proceedings of the Eighth International Conference on Data Engineering, Tempe, Arizona, pages 88-97, February 1992. [15] E. N. Hanson. Rule Condition Testing and Action Execution in Ariel. In Proceedings of the ACM SIGMOD International Conference on Management of Data, pages.

Kiernan. The A-RDL System. Chapter 5 in [2]. [9] S. Chakravarthy et al. HiPAC: A Research Project in Active, TimeConstrained Database Management. Technical Report, XAIT-89-02, Xerox Advanced Information Technology, Cambridge, Massachusetts, July 1989. [10] S. Chakravarthy, E. Anwar, L. Maugis, and D. Mishra. Design of Sentinel: An Object-Oriented DBMS with Event-Based Rules. Information and Software Technology, vol. 36, no. 9, pages 559-568, 1994. [11] U. Dayal, M. Hsu, and R. Ladin. Organizing Long-Running Activities with Triggers and Transactions.

However, as shown in [4], the use of this technique is difficult to employ in an active database framework. In this section, we outline a technique that aims to fulfill the second point above. 39 Consider the case of jobs which consist of a first execution phase where update and read operations are issued either by the ET or the RMT's, followed by a second phase where only read operations occur. We call this a writethen-read job. The technique presented in [22] consists in executing all the read operations that belong to the second phase of the job using a multiversion concurrency protocol (called EMV2PL)5 In this protocol read operations do not acquire locks on their data item but instead access versions of data items.

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