Download PDF by Carlo Zaniolo, Stefano Ceri, Christos Faloutsos, Richard T.: Advanced Database Systems

By Carlo Zaniolo, Stefano Ceri, Christos Faloutsos, Richard T. Snodgrass, V.S. Subrahmanian, Roberto Zicari

The database box has skilled a swift and relentless development because the improvement of relational databases. The development in database structures and functions has produced a various panorama of specialised expertise components that experience usually develop into the unique area of study experts. Examples contain lively databases, temporal databases, object-oriented databases, deductive databases, vague reasoning and queries, and multimedia details platforms. This booklet presents a systematic advent to and an in-depth remedy of those complex database parts. It provides practitioners and researchers with authoritative insurance of contemporary technological advances which are shaping the way forward for advertisement database structures and clever info structures.

Advanced Database platforms was once written through a crew of six prime experts who've made major contributions to the advance of the expertise components lined within the ebook. taking advantage of the authors' lengthy event educating graduate classes, this publication is designed to supply a steady advent to complex examine themes and contains many examples and routines to aid its use for person learn, table reference, and graduate school room instructing.

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With complex events, the rule processing system must include a sophisticated mechanism in order to check whether a given rule is triggered at a given point of the transaction's execution. Consideration of active rules relative to the event being monitored can be immediate, deferred, or detached: " Immediate consideration can occur BEFORE the event being monitored, AFTER the event, or INSTEAD OF the event; in this last option, the event primitive is not executed, and the rule's action is executed instead.

Instead, rules could be coded by assuming that the constraint holds on the initial state; in that case, it is sufficient to compute the condition relative to transition values. Next we write four optimized maintenance rules for the same example, which use transition values for achieving efficiency in the computation. Events and conditions do not change, but the action is generated according to the referential integrity policy. Note that, in order to implement these policies, each of the events producing a violation is associated with a different active rule.

2 Semantics of DB2 Triggers Before-triggers are typically used to detect error conditions and to condition input values; an assignment statement allows the body of these triggers to set the values of NEW transition variables. Before-triggers appear to execute entirely before the event that they monitor; thus, their conditions and actions must read the database state prior to any modification made by the event. They cannot modify the database by using UPDATE, DELETE, and INSERT statements, so that they do not recursively activate other triggers.

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