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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Contents: CS W186 Spring 2019 Midterm 2 Do not turn this page until instructed to start the exam. • You should receive one double-sided answer sheet and a 20-page exam packet. • The midterm has 6 questions, each with multiple parts. • The midterm is worth a total of 76 points. Taking the exam: •
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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].
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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 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 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 W186 Spring 2020 Hashing 1 Motivation Sometimes, sorting is a bit overkill for the problem. In a lot of cases, all we want is to group the same value together, but we do not actually care about the order the values appear in (think GROUP BY or de-duplication). In a database, grouping like values
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CS W186 Introduction to Database Systems Spring 2020 Josh Hug, Michael Ball DIS 5 1 General External Merge Sort Assumptions – N pages to sort, B buffer pages in memory Pass 0 – Use B buffer pages. Produce N sorted runs of B pages each. B Further passes – Merge B − 1 runs. Last
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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
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