Advanced Transaction Models and Architectures by Devashish Worah, Amit Sheth (auth.), Sushil Jajodia, Larry

By Devashish Worah, Amit Sheth (auth.), Sushil Jajodia, Larry Kerschberg (eds.)

Motivation Modem organizations depend on database administration structures (DBMS) to assemble, shop and deal with company information, that's thought of a strategic company re­ resource. lately, with the proliferation of private pcs and departmen­ tal computing, the fashion has been in the direction of the decentralization and distribution of the computing infrastructure, with autonomy and accountability for info now living on the departmental and workgroup point of the association. clients wish their information dropped at their computers, permitting them to incor­ porate facts into their own databases, spreadsheets, observe processing document­ uments, and most significantly, into their day-by-day projects and actions. they need for you to percentage their details whereas maintaining keep watch over over its entry and distribution. There also are pressures from company leaders who desire to use details expertise as a strategic source in delivering really good value-added providers to consumers. Database expertise is getting used to control the information linked to company tactics and actions. more and more, the information being controlled aren't easily formatted tables in relational databases, yet every kind of ob­ jects, together with unstructured textual content, pictures, audio, and video. hence, the database administration prone are being requested to increase the functions of DBMS to incorporate object-relational types in addition to complete object-oriented database guy­ agement systems.

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S ~ bo. ~ ......................... -...................... , ............................... 1 System Schematic for the Recovery Framework in ORBWork In METEOR2, the workflow process that defines the overall organizational process is captured in the form of a workflow map that is specified by a workflow designer. This determines the data and control dependencies that need to be enforced as part of the workflow scheduling process. Due to the distributed nature of the workflow engine, ORB Work does not have a centralized TRANSACTIONS IN TRANSACTIONAL WORKFLOWS 23 scheduling entity.

Task: A task represents the basic unit of computation within an instance of the workflow enactment process. It could be either transactional or non-transactional in nature. Each of these categories can be further divided based 01) whether the task is an application, or a user-oriented task. Application tasks are typically computer programs or scripts that could be arbitrarily complex in nature. A user task involves a human performing certain actions that might entail interaction with a GUI-capable terminal.

The task manager acts as an intermediary between the task and the workflow scheduler. It is responsible for making the inputs to the task available in the desired format, for submitting the task for execution at the processing entity, and for collecting the outputs (if any) from the task. In addition, the task manager communicates the status of the task to the workflow scheduler. • Workflow Scheduler: The workflow scheduler is responsible for coordinating the execution of various tasks within a workflow instance by enforcing inter-task dependencies defined by the underlying business process.

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