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Question
During logic modeling, the normalized data requirements from all user interfaces are combined into one consolidated logical database model.Answer
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Related questions
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All of the following are types of user documentation EXCEPT:
A) release description.
B) reference guide.
C) acceptance sign-off.
D) entity-relationship diagrams.
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Changing over from the old information system to a new one by turning off the old system as the new one is turned on best describes:
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B) single location installation.
C) parallel installation.
D) direct installation.
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The organizational process of changing over from the current information system to a new one best defines:
A) reorganization.
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User testing of a completed information system using real data in the real user environment refers to:
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B) alpha testing.
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The process of bringing together all of the modules that comprise a program for testing purposes is referred to as:
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D) implementation.
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Testing each module alone in an attempt to discover any errors that may exist in the module's code is referred to as:
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During alpha testing, users test a completed information system using simulated data.
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Walkthroughs are a very effective method for identifying errors in code.
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Which is the primary key(s) in the following STUDENT_GRADE(StudentID, CourseID, Grade)?
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If OrderNumber serves as the primary key in the ORDER relation and also appears as a nonkey attribute in the INVOICE relation, then OrderNumber is said to be a:
A) foreign key.
B) candidate key.
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Q:
The primary deliverable from logical database design is:
A) normalized relations.
B) design specifications.
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Q:
Key physical database design decisions typically do not include:
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Q:
Which of the following is NOT a key step in logical database design?
A) Combine normalized data requirements from all user interfaces into one consolidated logical database model.
B) Compare the consolidated logical database design with the translated E-R model and produce, through view integration, one final logical database design for the application.
C) Model how data flow through an information system, the relationships among the data flows, and how data come to be stored at specific locations.
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Designing the database for an Internet-based electronic commerce application differs significantly from the process followed when designing the database for other types of applications.
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Multiple key retrieval is possible with sequential file organization.
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Indexes should be used generously for databases intended primarily to support data retrievals.
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Sequential files are practical for random row retrievals.
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View integration is the last step of logical database design.
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A recursive foreign key is a foreign key in a relation that references the primary key value of the same relation.
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For a binary one-to-one relationship between two entities, A and B, the primary key of A becomes a foreign key in B and the primary key in B becomes a foreign key in A.
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Each entity type in an ER Diagram becomes an attribute.
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The creation of a separate relation is sometimes required to represent a relationship.
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A relation is said to be in second normal form if the primary key consists of only one attribute.