Fil:Physical Data Model Options.jpg
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Beskrivelse
| Beskrivelse |
English: Physical Data Model —Options.
The Physical Data Model (PDM) describes how the information represented in the Logical Data Model is actually implemented, how the information-exchange requirements are implemented, and how the data entities and their relationships are maintained. There should be a mapping from a given Logical Data Model to the Physical Data Model if both models are used. The form of the Physical Data Model can vary greatly, as shown in Figure 31. For some purposes, an additional entity-relationship style diagram will suffice. The Data Definition Language (DDL) may also be used. References to message format standards (which identify message types and options to be used) may suffice for message-oriented implementations. Descriptions of file formats may be used when file passing is the mode used to exchange information. Interoperating systems may use a variety of techniques to exchange data, and thus have several distinct partitions in their Physical Data Model with each partition using a different form. The figure illustrates some options for expressing the Physical Data Model and an other table (in the original document) provides a listing of the types of information to be captured. |
| Dato | |
| Kilde | Treasury Enterprise Architecture Framework. Version 1, July 2000 |
| Opphavsperson | Department of the Treasury Chief Information Officer Council |
Lisensiering
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| Dato/klokkeslett | Miniatyrbilde | Dimensjoner | Bruker | Kommentar | |
|---|---|---|---|---|---|
| nåværende | 20. des. 2008 kl. 03:17 | | 828 × 484 (73 KB) | Mdd | == Summary == {{Information |Description={{en|Physical Data Model —Options.}} |Source= [http://www.eaframeworks.com/TEAF/teaf.doc Treasury Enterprise Architecture Framework]. Version 1, July 2000 |Date=July 2000 |Author= Department of the Treasury Chief |
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