What is chkdsk?

A) A program used to locate and identify lost clusters
B) A program used to defragment the hard drive
C) A command used to scan the disk for viruses during off hours
D) A command used to verify the validity of the drive surface before installing a file system or an operating system

A

Computer Science & Information Technology

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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?

Computer Science & Information Technology

What function traps errors in a custom template?

A. ERRORTRAP B. IF(#ErrorValue) C. IFERROR D. FINDERROR

Computer Science & Information Technology