Give an example of a schedule produced by a nonstrict two-phase locking concurrency control that is not recoverable.
What will be an ideal response?
lock1(x)w1(x)unlock1(x) lock2(x)r2(x) lock2(y)w2(y)unlock2(x, y) commit2abort1
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For the data set with the attributes given below, describe how you would con- vert it into a binary transaction data set appropriate for association analysis. Specifically, indicate for each attribute in the original data set
(a) How many binary attributes it would correspond to in the transaction data set, (b) How the values of the original attribute would be mapped to values of the binary attributes, and (c) If there is any hierarchical structure in the data values of an attribute that could be useful for grouping the data into fewer binary attributes. The following is a list of attributes for the data set along with their possible values. Assume that all attributes are collected on a per-student basis: Year : Freshman, Sophomore, Junior, Senior, Graduate:Masters, Grad- uate:PhD, Professional Zip code : zip code for the home address of a U.S. student, zip code for the local address of a non-U.S. student College : Agriculture, Architecture, Continuing Education, Education, Liberal Arts, Engineering, Natural Sciences, Business, Law, Medical, Dentistry, Pharmacy, Nursing, Veterinary Medicine On Campus : 1 if the student lives on campus, 0 otherwise Each of the following is a separate attribute that has a value of 1 if the person speaks the language and a value of 0, otherwise. – Arabic – Bengali – Chinese Mandarin – English – Portuguese – Russian – Spanish
Which numbered item indicates a text area in the accompanying figure?
A. 1 B. 3 C. 5 D. 6
________ provide a way to automate tasks that you might need to perform repeatedly
Fill in the blank(s) with correct word
Go to the SEI’s website on System of Systems at http://www.sei.cmu.edu/sos/. Document the main differences for a system analyst working at this scale, and describe the role CASE tools could play across the SDLC to help the analyst function effectively in such a complex environment.
What will be an ideal response?