By Devashish Worah, Amit Sheth (auth.), Sushil Jajodia, Larry Kerschberg (eds.)
Motivation Modem organisations depend on database administration platforms (DBMS) to assemble, shop and deal with company facts, that is thought of a strategic company re resource. lately, with the proliferation of non-public pcs and departmen tal computing, the rage has been in the direction of the decentralization and distribution of the computing infrastructure, with autonomy and accountability for information now living on the departmental and workgroup point of the association. clients wish their facts dropped at their computers, permitting them to incor porate info into their own databases, spreadsheets, observe processing document uments, and most significantly, into their day-by-day initiatives and actions. they need with a view to percentage their info whereas conserving regulate over its entry and distribution. There also are pressures from company leaders who desire to use details know-how as a strategic source in supplying really expert value-added providers to consumers. Database know-how is getting used to regulate the knowledge linked to company approaches and actions. more and more, the knowledge being controlled should not easily formatted tables in relational databases, yet all kinds of ob jects, together with unstructured textual content, pictures, audio, and video. therefore, the database administration prone are being requested to increase the functions of DBMS to incorporate object-relational versions in addition to complete object-oriented database guy agement systems.
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Additional resources for Advanced Transaction Models and Architectures
Sheth, D. Worah and K. Zheng. This research was partially done under a cooperative agreement between the National Institute of Standards and Technology Advanced Technology Program (under the HIlT contract, number 70NANB5HlOII) and the Healthcare Open Systems and Trials, Inc. consortium. html. Additional partial support and donations are provided by Post Modern Computing, Illustra Information Technology, and Hewlett-Packard Labs. 34 ADVANCED TRANSACTION MODELS AND ARCHITECTURES Appendix: A Normative Perspective Advanced Transaction Models Workflow Systems Theoretical Foundation Usually good theoretical basis.
C:::::::::J End CondItIon c:::::::::J State c:::::::::J The execution unit as the basic building block of a workflow model Process is the equivalent of a program. It specifies the execution logic by linking execution units via control and data connectors. To allow nesting, a process can be represented as an execution unit, in which case it becomes one more step within another process. 3. 3 SystIfm Events PROCESS STATES State diagram of a process Blocks allow the modular decomposition of a process very much like in structured programming.
3 we define a hierarchical error model that fonns the basis for handling errors in the METEOR2 WFMS. In the previous sections, we have discussed research done in the area of ATMs, transactional workflows, and the problem of error handling and recovery in WFMSs. In the next section we outline issues that are important for implementing a reliable WFMS. In doing so, we discuss a specific example of a WFMS that exploits many of the concepts from transactional systems and ATMs to include support for error handling and recovery.