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Erschienen in:
1985 | OriginalPaper | Buchkapitel
Design Transaction Management
verfasst von : Prof. Randy H. Katz
Erschienen in: Information Management for Engineering Design
Verlag: Springer Berlin Heidelberg
Enthalten in: Professional Book Archive
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A transaction is a sequence of operations that together perform a unit of work, and leave the database in a consistent state. A set of constraints are in force at the beginning of the transaction and again at its end, but they are not enforced during the lifetime of the transaction. A key difference between the design environment and a conventional database environment is that the definition of design self-consistency is significantly more complex. For example, an airplane design is “consistent” only if the airplane can still fly with its redesigned wing. In general, these constraints can only be guaranteed by invoking complicated checking programs such as simulation tools.