CS W186 Spring 2020 Query Optimization 1 Introduction When we covered SQL, we gave you a helpful mental model for how queries are executed. First you get all the rows in the FROM clause, then you filter out columns you don’t need in the WHERE clause, and so on. This was useful because it guarantees […]
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CS W186 Introduction to Database Systems Spring 2020 Josh Hug, Michael Ball DIS 11 1 Recovery Q1 Consider the execution of the ARIES recovery algorithm given the following log (assume a check- point is completed before LSN 0 and the Dirty Page Table and Transaction Table for that check- point are empty): (a) During Analysis,
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CS 186/286 Fall 2017 Final Exam • Do not turn this page until instructed to start the exam. • You should receive 1 answer sheet and a 25-page exam packet. • All answers should be written on the answer sheet. The exam packet will be collected but not graded. • You have 3 hours to
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CS W186 Introduction to Database Systems Spring 2020 Josh Hug, Michael Ball DIS 11 1 Recovery Q1 Consider the execution of the ARIES recovery algorithm given the following log (assume a check- point is completed before LSN 0 and the Dirty Page Table and Transaction Table for that check- point are empty): (a) During Analysis,
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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 9-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 Spring 2020 Iterators and Joins 1 Introduction Let’s begin with the simplest question: what, exactly, is a join? If you remember the SQL project, you’ll remember writing things like R INNER JOIN S ON R.name = S.name and other similar state- ments. What that actually meant is that you take two relations, R
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Contents: CS W186 Spring 2019 Midterm 1 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 5 questions, each with multiple parts. • The midterm is worth a total of 60 points. Taking the exam: •
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CS W186 Spring 2020 Parallel Query Processing 1 Introduction Up until this point we have assumed that our database is running on a single computer. For modern applications that deal with millions of requests over terabytes of data it would be impossible for one computer to quickly respond to all of those requests. We need
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CIS 191 Final Project You will write a stock market trading algorithm. You will use historical stock market data and decide when and how much to buy or sell a stock. Your program, as a simulation, will be fed this historical stock data to ‘replay’ the days of trading for that stock. You will have
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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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