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

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

ISBN-10: 155860443X

ISBN-13: 9781558604438

The database box has skilled a quick and constant progress because the improvement of relational databases. The development in database structures and functions has produced a various panorama of specialised expertise parts that experience usually turn into the unique area of analysis experts. Examples contain energetic databases, temporal databases, object-oriented databases, deductive databases, obscure reasoning and queries, and multimedia details structures. This publication presents a systematic advent to and an in-depth therapy 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 details structures.

Advanced Database structures was once written by way of a workforce of six prime experts who've made major contributions to the improvement of the know-how components lined within the ebook. profiting from the authors' lengthy adventure educating graduate classes, this ebook is designed to supply a gentle creation to complex study subject matters and contains many examples and workouts to aid its use for person learn, table reference, and graduate lecture room educating.

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Extra resources for Advanced Database Systems

Sample text

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.

Variables introduced in the condition can be used in the action, carrying along from the condition to the action the bindings induced by the computation of the condition. The before and after clauses introduce, as in Starburst, a partial order between triggers, which is useful during rule processing when multiple triggers are in the triggered state. As in Starburst, the precedence relationship induced by the before and after clauses must be acyclic. Special binary predicates occurred and holds can be used within the conditions of triggers.

Several triggers (with either row- or statement-level granularity) can monitor the same event. They are considered according to a system-determined total order, which takes into account the triggers' definition time. 3. DB2 21 Row- and statement-level triggers are intertwined in the total order. 2 Rowlevel triggers are considered and possibly executed once for each tuple, while statement-level triggers are considered and possibly executed once per statement. If the action of a row-level trigger has multiple statements, all statements are executed for one row before considering the next row.

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Advanced Database Systems by Carlo Zaniolo, Stefano Ceri, Christos Faloutsos, Richard T. Snodgrass, V.S. Subrahmanian, Roberto Zicari

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