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 w186 Introduction to Database Systems Prof. Josh Hug Essential Queries • Why take this class? • What is this class all about? • Who is running this? • How will this class work? Who Am I? • 6th year faculty at UC Berkeley. Freshly tenured as of July 1st. • My title is “Associate
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CS W186 Spring 2020 B+ Trees 1 Introduction An index is a data structure that helps speed up reads on a specific key. We use indexes to make queries run faster, especially queries that are run frequently. For example, to make login faster you may want to build an index on username so that you
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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].
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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 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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