CS W186 Introduction to Database Systems Spring 2020 Josh Hug, Michael Ball DIS 2 1 True and False Solution: (a) When querying for a 16 byte record, exactly 16 bytes of data is read from disk. False, an entire page of data is read from disk. (b) Writing to an SSD drive is more costly […]
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CS W186 Introduction to Database Systems Spring 2020 Josh Hug, Michael Ball DIS 10 1 ER Diagrams We want to store sports teams and their players in our database. Draw an ER diagram correspond- ing to data given below: • Every Team in our database will have a unique team_name and a stadium where they
CS W186 Introduction to Database Systems Spring 2020 Josh Hug, Michael Ball DIS 3 1 Indices (B+ Trees) Assume we have the following B+ Tree of order 1. Each index node must have either 1 or 2 keys (2 or 3 pointers), and the leaf nodes can hold up to 2 entries. (a) What is
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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 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 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 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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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 21-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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CS W186 Introduction to Database Systems Spring 2020 Josh Hug, Michael Ball DIS 3 1 Indices (B+ Trees) Assume we have the following B+ Tree of order 1. Each index node must have either 1 or 2 keys (2 or 3 pointers), and the leaf nodes can hold up to 2 entries. (a) What is
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CS W186 Introduction to Database Systems Spring 2020 Josh Hug, Michael Ball DIS 2 1 True and False (a) When querying for a 16 byte record, exactly 16 bytes of data is read from disk. (b) Writing to an SSD drive is more costly than reading from an SSD drive. (c) In a heap file,
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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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