[CSCI3170]L4sol.docx - CSCI3170 Classwork#L4 Name Student...

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(Sort-Merge Join) On-the-fly: Write to T1 On-the-fly: Write to T2 (File scan) (Cluster B+ tree on age) CSCI3170 Classwork (#L4) Name: Pass / Fail Student ID: Consider the following three relations for the database in a company: Worker ( W ID : integer , Name : string, age: integer, rating : integer) Project ( PID : integer , project_name : string, budget : real) Work_in ( P ID : integer , WID : integer , since: date) Assumptions : Assume 60 21 age Assume 1 ≤rating≤ 10 The distribution of age in Worker is uniform. The distribution of rating in Worker is uniform. Worker: 50 tuples per page, 1000 pages Project : 60 tuples per page, 2000 pages Work_in : 40 tuples per page, 5000 pages The buffer size is 20 pages. Consider the following execution plan. Assume the sizes of T1 and T2 are 20 and 50 pages respectively.
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i) Calculate the number of page accesses for scanning the table
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  • Spring '19
  • Writing, Following, Exponentiation, Pages

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