By Umeshwar Dayal (auth.), Mikael Berndtsson MSc, Jörgen Hansson MSc (eds.)
The components of lively and real-time databases have noticeable a huge development of curiosity some time past few years, fairly in regards to their aid of time-critical and embedded purposes. ARTDB-95 supplied, hence, a massive 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 provided on the workshop, this quantity additionally includes four invited papers at the following issues: the impression of energetic databases on advertisement perform; the optimization of energetic database transactions; the necessity for greater language, compiler and power help for real-time databases; and the starting place of time constraints linked to facts, occasions and activities. jointly the papers supply a finished review of present study, and should offer worthy interpreting for educational and commercial researchers and scholars at either undergraduate and postgraduate level.
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Additional resources for Active and Real-Time Database Systems (ARTDB-95): Proceedings of the First International Workshop on Active and Real-Time Database Systems, Skövde, Sweden, 9–11 June 1995
Optimiza- 49 tion and allocation for high-performance database machines is anything but trivial. Classic parallelization approaches do not suffice due to such factors as synchronization and pipelining/ caching methods do not work well because of transaction coordination (and even sequencing that cannot be caught by network management) issues. Fusing data, in the presence of conflicting nonfunctional objectives (such as timeliness vs. , in a very fast network and relatively slow PE situation a small perturbation in PE units would lead to a very significant effect while the same in communication units would be virtually unnoticed).
Dynamically, it is possible to examine all the rules that need to be executed just before the commit-transaction point, and try to order them so that after a particular task, all the remaining RMT's only perform read operations. This corresponds to the lockpoint (case 2) set in Figure 7. Statically, it is possible to know in advance just by looking at the structure of the ET that none of the RMT's executed just before the commit-transaction point issues an operation that changes the database. In this case the lockpoint can be set statically in the ET as shown in Figure 7 (case 1).
However, as shown in , 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  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.