CS W186 Spring 2020 Midterm 2 (Online) Do not share this exam until solutions are released. Contents: • The midterm has 6 questions, each with multiple parts, and worth a total of 85 points. Taking the exam: • You have 150 minutes to complete the midterm. • You may print this exam or download it […]
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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 11-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 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 1 1 Single-Table SQL Write SQL queries to accomplish each task below. You will not need to join any tables. Assume you have access to tables with the following schemas, where each primary key is in ALL_CAPS: • Songs(SONG_ID, song_name, album_id, weeks_in_top_40)
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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 Spring 2020 Transactions 1 Introduction In reality, we usually don’t have just one person accessing a database at a time. Many users can make requests to a database at a time which can cause concurrency issues. What happens when one user writes and then another user reads from the same resource? What if
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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 Introduction to Database Systems Spring 2020 Josh Hug, Michael Ball DIS 5 1 General External Merge Sort Given – 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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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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