By Carlo Zaniolo, Stefano Ceri, Christos Faloutsos, Richard T. Snodgrass, V.S. Subrahmanian, Roberto Zicari
The database box has skilled a quick and constant progress because the improvement of relational databases. The growth in database platforms and purposes has produced a various panorama of specialised know-how components that experience usually turn into the specific area of analysis experts. Examples contain lively databases, temporal databases, object-oriented databases, deductive databases, obscure reasoning and queries, and multimedia details structures. This e-book presents a systematic creation to and an in-depth remedy of those complicated database parts. It offers practitioners and researchers with authoritative assurance of contemporary technological advances which are shaping the way forward for advertisement database platforms and clever info structures.
Advanced Database platforms was once written via a staff of six prime experts who've made major contributions to the improvement of the expertise parts lined within the publication. profiting from the authors' lengthy adventure instructing graduate classes, this e-book is designed to supply a gentle advent to complex study subject matters and comprises many examples and routines to aid its use for person research, table reference, and graduate school room instructing.
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Extra resources for Advanced Database Systems
3 Examples of Trigger Executions Consider a database schema including tables Part, Distributor, and Audit. The Part table includes PartNum as primary key, and the attributes Supplier and Cost; assume that HDD is the default supplier. 3. DB2 Distributor City State Jones Taylor HDD Palo Alto Minneapolis Atlanta California Minnesota Georgia Next, consider two triggers. The before-trigger OneSupplier avoids a change of the Supplier value to NULL by raising an exception that forces a statement-level rollback; note that this trigger does not prevent the insertion of tuples with a null value for Supplier.
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.
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. 3 DB2's statement processing procedure 1. Suspend the execution of A, and save its working storage on a stack. 2. Compute transition values (OLD and NEW) relative to event E.