New PDF release: Database Integrity: Challenges and Solutions

By Laura C. Rivero, Jorge H. Doorn

One of many riding forces that prompted the emergence of database expertise was once the necessity to warrantly the standard of the knowledge kept. The software program layout is impacted by way of the houses of the information. info houses could be visible from some degree of view as independently as attainable from the illustration version. within the database global, caliber of information implies that all these houses are correctly represented and preserved. effective upkeep of information integrity has develop into a severe challenge given that trying out the validity of a big variety of constraints in a wide database, after each one transaction is a dear job. aimed toward designers and pros drawn to the conceptual features of integrity difficulties in several paradigms, Database Integrity: demanding situations and recommendations effectively addresses those and numerous different matters.

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When the right side is properly modeled, the real- world relationship is represented as a key-based inclusion dependency (usually named referential integrity restrictions) in the database world. In this case, the attribute or a set of attributes–which materializes the reference and pertains to the left term–is named the foreign key and the connection is based either on the primary key or on an alternate key of the right side table. On the other hand if the right side is a hidden entity, a non-key (pure) inclusion dependency represents the relationship, and its terms have no special names.

Other options are: do not permit the deletion (update) if there are objects designing it; destroy the link between the objects nullifying the reference in the designator; or label the link as invalid replacing it by a default value. These options are named cascade, restricted (no action), set null and set default, respectively. They are fully - 30 - Database Integrity: Challenges and Solutions described in the following section and are the standard actions. ) that can be implemented in combination with the standard ones and with prompts to allow the users to execute specific actions (Etzion, 1993).

Statement- level triggers are the only supported ones. The default granularity is FOR EACH ROW and the activation time is AFTER. Examples - 54 - Database Integrity: Challenges and Solutions Since none of the reference systems allows the declarative definition of "ON INSERT CASCADE", the following example illustrates this issue, in relation with the Medicare Organization example. In this case, the desired behavior is that when a TITULAR_AFILIATE is inserted, the corresponding tuple in the FAMILY_GROUP_COMPONENT table must be inserted too (see the relationship between these two entities in Figure 3).

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