RAID systems typically allow you to replace failed disks without stopping access to the system. Thus, the data in the failed disk must be rebuilt and written to the replacement disk while the system is in operation. With which of the RAID levels is the amount of interference between the rebuild and ongoing disk accesses least? Explain your answer.
Answer to relevant QuestionsGive an example of a relational-algebra expression and a query-processing strategy in each of the following situations:a. MRU is preferable to LRU.b. LRU is preferable to MRU.Show the structure of the file of Figure after each of the following steps:a. Insert (Mianus, A-101, 2800).b. Insert (Brighton, A-323, 1600).c. Delete (Perryridge, A-102,400).Consider a relational database with two relations: course (course-name, room instructor) enrollment (course-name, student-name, grade) Define instances of these relations for three courses, each of which enrolls five ...Since indices speed query processing, why might they not be kept on several search keys? List as many reasons as possible.What are the causes of bucket overflow in a hash file organization? What can be done to reduce the occurrence of bucket overflows?
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