Database systems can greatly reduce the amount of redundancy involved in storing data.Does this imply that database systems may in fact be less reliable than nondatabase systems? Explain your answer.
What will be an ideal response?
No. If anything, great attention has been devoted to building reliable database systems.
The redundancy is of two flavors. Redundancy inherent in the data is what database
systems eliminate, but they still use redundancy for reliability purposes.
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Consider the following database schema. The attributes are ABCDEF. The FDs are:
ABF -> C CF -> B CD -> A BD -> AE C -> F B -> F (a) Compute the attribute closure of ABD with respect to the above set of FDs. Show all steps. (b) Compute the minimal cover of the above set of FDs. Show all steps. (c) Use the 3NF synthesis algorithm to construct a lossless, dependency preserving decomposition of the above schema. Show all steps. (d) Are all the schemas in the resulting decomposition in BCNF? If yes, then you are done. If there are schemas that are not in BCNF, decompose them further to achieve BCNF. Is the resulting decomposition dependency-preserving? Explain all steps: yes/no answers do not count. (a) What is a functional dependency? (b) Explain why a primary key constraint is an example of a functional dependency. (c) State the conditions (in terms of functional dependencies) for a relation to be in 3rd normal form and in BCNF. (d) Consider a relation in a library system with the following attributes: author (A), title (T), copy number (C), author's year of birth (B), shelf (Sh), subject (Sub). If the library has multiple copies of a particular book they are numbered consecutively with (unique) copy numbers. Shelf is the location of a particular book and all the books on a shelf are in the same subject category. What are the functional dependencies? Decompose the relation into two or more relations to eliminate redundant storage of information. In what normal form are the relations that result from your decomposition?
A blinking vertical line that indicates where text or graphics will be placed is called the ________
Fill in the blank(s) with correct word
A viewer ____ is a set of data describing the viewer you are trying to reach.
a. identity b. template c. brand d. profile
The cell that contains the formula-based value that you want to maximize, minimize, or set to a value in Solver.
What will be an ideal response?