DB Chapter 4.txt

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fill123456
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46134
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DB Chapter 4.txt
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2010-10-30 18:01:53
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DB Glossary
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DB Glossary
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  1. Action:
    • An operation, such as create, delete, update, or read,
    • which may be performed on data objects. (4)
  2. Action assertion:
    • A statement of a constraint or control on
    • the actions of the organization. (4)
  3. Anchor object:
    • A business rule (a fact) on which actions are
    • limited. (4)
  4. Attribute inheritance:
    • A property by which subtype entities
    • inherit values of all attributes and instances of all
    • relationships of the supertype. (4)
  5. Completeness constraint:
    • A type of constraint that
    • addresses the question whether an instance of a supertype
    • must also be a member of at least one subtype. (4)
  6. Corresponding object:Abusiness rule (a fact) that influences
    • the ability to perform an action on another business
    • rule. (4)
  7. Derivation:
    • A statement derived from other knowledge in
    • the business. (4)
  8. Derived fact:
    • A fact that is derived from business rules
    • using an algorithm or inference. (4)
  9. Disjoint rule:
    • A rule that specifies that an instance of a
    • supertype may not simultaneously be a member of
    • two (or more) subtypes. (4)
  10. Disjointness constraint:
    • A constraint that addresses the
    • question whether an instance of a supertype may simultaneously
    • be a member of two (or more) subtypes. (4)
  11. Enhanced entity-relationship (EER) model:
    • The model that
    • has resulted from extending the original E-R model
    • with new modeling constructs. (4)
  12. Entity cluster:
    • A set of one or more entity types and associated
    • relationships grouped into a single abstract
    • entity type. (4)
  13. Generalization:
    • The process of defining a more general entity
    • type from a set of more specialized entity types. (4)
  14. Overlap rule:
    • A rule that specifies that an instance of a
    • supertype may simultaneously be a member of two
    • (or more) subtypes. (4)
  15. Partial specialization rule:
    • Specifies that an entity instance
    • of the supertype is allowed not to belong to any
    • subtype. (4)
  16. Specialization:
    • The process of defining one or more subtypes
    • of the supertype and forming supertype/subtype
    • relationships. (4)
  17. Structural assertion:
    • A statement that expresses some
    • aspect of the static structure of the organization. (4)
  18. Subtype:
    • A subgrouping of the entities in an entity type that
    • is meaningful to the organization and that shares
    • common attributes or relationships
  19. Subtype discriminator:
    • An attribute of the supertype whose
    • values determine the target subtype or subtypes. (4)
  20. Supertype:
    • A generic entity type that has a relationship
    • with one or more subtypes. (4)
  21. Supertype/subtype hierarchy:
    • A hierarchical arrangement
    • of supertypes and subtypes, where each subtype has
    • only one supertype. (4)
  22. Total specialization rule:
    • Specifies that each entity instance
    • of the supertype must be a member of some subtype
    • in the relationship. (4)
  23. Universal data model:
    • A generic or template data model that
    • can be reused as a starting point for a data modeling
    • project. (4)

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