Which of the following steps may not be used to define the existing data model as a precursor to re-engineering a new database model:
A. Build an initial object model
B. Determine candidate keys
C. Refine the tentative classes
D. Discover user interfaces
Answer:A
Which of the following steps may not be used to define the existing data model as a precursor to re-engineering a new database model:
A. Build an initial object model B. Determine candidate keys C. Refine the tentative classes D. Discover user interfaces
Explanation:Once information defined in the preceding steps is known, a series of transformations can be applied to map the old database structure into a new database structure. 9. Much of the information necessary to create a behavioral model can be obtained by observing the external manifestation of the existing