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  1. A) Consider a database with objects A, B, and C, and the following two transactions T₁ and T₂ involving those objects: T₁ T₂ begin_transaction begin_transaction read(A) read(A) read(B) read(B) read(C) read(C) If A = 13, B := B + B if B = 13, A := A + 1 C := C + 3 C := C + 2 write(B) write(A) write(C) write(C) Commit commit Let the initial values of A and B be 13, and the initial value of C be 10. Also let the consistency requirement be: either A = 13 or B = 13 Show the values that A, B and C would have after the (serial) execution of transaction T₁ followed by the execution of T₂. Show the values of A, B and C if the transactions were executed in the reverse order instead, that is, first T₂ was executed, and then T₁. b) Describe what Database consistency means and using the two findings in part(a) above, show that every serial execution of these two transactions T₁ and T₂ preserves the consistency of the database. (Limit your answer to 60 words) c) This question assumes the following relation schema: Employees(employeeNumber, lastName, firstName, DOB, HireDate, Position, Salary, DeptID) Primary Key: employeeNumber Foreign Key: DeptID refers to DeptID in Departments Departments(DeptID, DeptName, DeptLocation) Primary Key: DeptID Given the following expression in the Relational Algebra: employeeNumber, lastName, firstName, DeptName((Position = 'Manager' Employees) Departments) Show the corresponding SQL query.
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  2. If I execute the expression x <- 4 in R, what is the class of the object `x' as determined by the `class()' function? matrix real complex vector integer numeric list
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  3. In R the following are all atomic data types EXCEPT: (Select all that apply) matrix list numeric data frame array complex character table integer logical
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  4. A system has two processes and three identical resources. Each process needs a maximum of two resources. Is deadlock possible? Explain your answer.
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  5. Consider a swapping system in which memory consists of the following hole sizes in memory order: 10 MB, 4 MB, 20 MB, 18 MB, 7 MB, 9 MB, 12 MB, and 15 MB. Which hole is taken for successive segment requests of (a) 12 MB (b) 10 MB (c) 9 MB for the first fit? Now repeat the question for best fit, worst fit, and next fit.
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  6. What value(s) will be output by the following Java code statements? System.out.println( Math.random() ); _________________ System.out.println( Math.random() * 3); _________________ System.out.println( (int)(Math.random()*10) + 2);
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