CS W186 Introduction to Database Systems Spring 2020 Josh Hug, Michael Ball DIS 7 1 Selectivity Estimation Consider a relation R(a, b, c) with 1000 tuples. We have an index on a with 50 unique values in the range [1, 50] and an index on b with 100 unique values in the range [1, 100]. […]
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CS 186/286 Spring 2018 Midterm 2 • Do not turn this page until instructed to start the exam. • You should receive 1 single-page answer sheet and a 15-page exam packet. • All answers should be written on the answer sheet. The exam packet will be collected but not graded. • You have 80 minutes
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CS 186/286 Fall 2017 Midterm 2 • Do not turn this page until instructed to start the exam. • You should receive 1 single-sided answer sheet and a 16-page exam packet. • All answers should be written on the answer sheet. The exam packet will be collected but not graded. • You have 80 minutes
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CS W186 Introduction to Database Systems Spring 2020 Josh Hug, Michael Ball DIS 4 1 Buffer Management (a) Fill in the following tables for the given buffer replacement policies. You have 4 buffer pages, with the access pattern A B C D A F A D G D G E D F CS W186, Spring
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CS W186 Fall 2018 Midterm 1 • Do not turn this page until instructed to start the exam. • You should receive one double-sided answer sheet and a 18-page exam packet. • All answers should be written on the answer sheet. The exam packet will be collected but not graded. • You have 80 minutes
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CS 186/286 Spring 2018 Midterm 1 • Do not turn this page until instructed to start the exam. • You should receive 1 single-sided answer sheet and a 13-page exam packet. • All answers should be written on the answer sheet. The exam packet will be collected but not graded. • You have 80 minutes
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CS W186 Introduction to Database Systems Spring 2020 Josh Hug, Michael Ball DIS 6 1 Assorted Joins • Companies: (company_id, industry, ipo_date) • NYSE: (company_id, date, trade, quantity) We have 20 pages of memory, and we want to join two tables Companies and NYSE on C.company_id = N.company_id. Attribute company_id is the primary key for
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CS W186 Introduction to Database Systems Spring 2020 Josh Hug, Michael Ball DIS 7 1 Selectivity Estimation Consider a relation R(a, b, c) with 1000 tuples. We have an index on a with 50 unique values in the range [1, 50] and an index on b with 100 unique values in the range [1, 100].
程序代写代做 IOS cache C database CS W186 Introduction to Database Systems Read More »
Contents: CS W186 Fall 2019 Final Do not turn this page until instructed to start the exam. • You should receive one double-sided answer sheet and a 28-page exam packet. • The midterm has 11 questions, each with multiple parts, and worth a total of 153.5 points. Taking the exam: • You have 170 minutes
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Contents: CS W186 Fall 2018 Final Do not turn this page until instructed to start the exam. • You should receive one double-sided answer sheet and a 33-page exam packet. • The final has 10 questions, each with multiple parts. • The final is worth a total of 126.5 points. Taking the exam: • You
程序代写代做 graph go IOS ER C database Functional Dependencies Contents: Read More »