CMPT 454程序写作、辅导c/c++，Java，Python编程

” CMPT 454程序写作、辅导c/c++，Java，Python编程CMPT 454 Assignment 3: Query EvaluationThis assignment is worth approximately 7% of your final grade.Question 1For each of the operations described below you are to calculate the number of disk reads (andwrites) to perform the operation in the most efficient way. Do not include the cost to write outthe result of the operation. Briefly explain the process of each operation and its components.For example, use the index on a, read x nodes of the index and y records of the file.Assume the root node of tree indexes and directory of extensible hash indexes are not held inmain memory at the start of the operation. [2 marks each, unless noted otherwise]Product = {pid, pname, ptype, pnumber, description, manufacturer, mcountry, mcity, price}Table Statistics (note for all V the table is the Product table)B(Product) T(Product) V(pid) V(pname) V(ptype) V(pnumber)25,000 250,000 250,000 50,000 500 1,000V(mcountry) V(mcity) V(manufacturer) V(price) V(description)40 1,000 10,000 50,000 125,000V({ptype, pnumber}) V({mcountry, mcity})250,000 2,500Indexes Primary dense B+ tree index on {ptype, pnumber} where ptype is the prefix of the search key.The index is height 4 (includes leaf and root level) and interior and leaf nodes contain 50search keys on average. B+ tree index on {mcountry, mcity} where mcountry is the prefix of the search key. The indexis height 5 (includes leaf and root level) and interior and leaf nodes contain 30 search keys onaverage.CMPT 454作业写作、辅导c/c++，Java，Python编程 B+ tree index on pname. The index is height 4 (includes leaf and root level) and interior andleaf nodes contain 60 search keys on average. Extensible hash index on pid. The directory resides on two disk blocks and each bucketcontains 100 search keys on average. Linear hash index on manufacturer. Each bucket contains 40 search keys on average thereare no overflow blocks.a) (ptype = ABC pnumber = 13) (Product)b) (ptype = ABC) (Product)c) (pid = 123456 pid = 678324) (Product)d) (mcountry = UK mcity = Sheffield) (Product)e) (mcity = Detroit) (Product)f) (pname = foo345 manufacturer = acme) (Product)g) (mcountry = Canada price 25.00 description = sweet widget) (Product)h) (pname = bar111 price = 73.80 ptype = TLR) (Product)i) ( (pname = foo17 price = 19.99) (ptype = HJK price = 19.99) (ptype = HJK pid = 432911) ) (Product)j) Sort the Product table assuming there are 100 main memory frames availablek) (ptype, description) (Product) assume there are 50 main memory frames available, and thatduplicates are not to be removedl) (ptype, description) (Product) assume there are 50 main memory frames available, and thatduplicates are to be removed using sort projection; also assume that duplicates are onlyencountered in the final stage of the process [4 marks]Note that ptype is 4 bytes, description is 96 bytes and pages are 4,096 bytesQuestion 2Answer the following questions about performing anatural join between the Patient and Visit tables. Theonly attribute the two tables have in common is msp,which is the primary key of Patient and a foreign key inVisit. Relevant information is shown to the right. [15]a) How many records will the joined relation contain? [1]b) Approximately how many records of the joined relation fit on a single block? [1]c) What is the main memory requirement (in frames) to perform the join in two passes usingthe sort-join algorithm? Briefly explain your calculation. [2]d) If Patient was already sorted on msp would your answer to part (b) change? Explain why orwhy not? [2]e) What is the main memory requirement (in frames) to perform the join in two passes usingthe hash-join Agorithm? Briefly explain your calculation. [2]f) Assume that there are approximately 1,200 frames available for performing the join; what isthe cost of Performing the join using the block nested loop join algorithm? Briefly explain yourcalculation. [3]g) Assume that there is a secondary extensible hash index on msp in Patient. If the directorypage of the index is retained in main memory, what is the cost of performing the join usingthe index nested loop join algorithm? Briefly explain your calculation. [3]h) Assume that there is a primary B+ tree index of height 3 on msp in Visit. If the root node ofthe index is retained in main memory, what is the cost of performing the join using the indexnested loopJoin algorithm? Briefly explain your calculation. [3]i) Assume that there are just over 4,000 frames available for performing the join; what is thecost of performing the join Using the hybrid hash join algorithm where one partition of theouter relation is to be retained in main memory? Briefly explain your calculation. [3]Visit PatientT(R) 1,800,000 180,000B(R) 180,000 18,000V(R, msp) 180,000 180,000如有需要，请加QQ：99515681 或邮箱：99515681@qq.com

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