Database Enviroment

Beschreibung

Part 2
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Zusammenfassung der Ressource

Database Enviroment
  1. ANSI-SPARC
    1. American National Standards Institute, Standards Planning And Requirements Committee.
      1. standard for DBMS
        1. Levels
          1. External
            1. user view
            2. Conceptual
              1. community view
              2. Internal
                1. physical representation of DB
            3. Advantages
              1. customized user view
                1. hides physical storage details from users
                  1. changes by DB admin doesn't effect user view
                  2. Data Model
                    1. documentation for data org.
                      1. Record- Based
                        1. Network
                          1. Hierarchial
                            1. Relational
                            2. Object- Based
                              1. Entity-Relationship
                                1. Functional
                                  1. Object-Oriented
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