CS W186 Fall 2019 DB Design 1 Introduction So far, we’ve learned how to use already built databases: SQL queries! We also learned the internals of a database management system which includes many abstraction levels. But what happens if we are given a high-level description of what data we want to store with our database? […]
程序代写代做 js C database Functional Dependencies CS W186 Read More »
CS W186 Spring 2020 Relational Algebra 1 Motivation In the previous notes we talked about how SQL is a declarative programming language. This means that you specify what you want, but you don’t have to specify how to do it. This is great from a user’s perspective as it makes the queries much easier to
程序代写代做 database CS W186 Read More »
Contents: CS W186 Spring 2019 Final Do not turn this page until instructed to start the exam. • You should receive one double-sided answer sheet and a 24-page exam packet. • The midterm has 9 questions, each with multiple parts. • The midterm is worth a total of 125.5 points. Taking the exam: • You
程序代写代做 graph game go IOS concurrency ER C database Functional Dependencies Contents: Read More »
CS W186 Spring 2020 Sorting In CS61B, you learned about many different sorting algorithms. Why are we learning yet another new one in this class? All of the traditional sorting algorithms (i.e. quick sort, insertion sort, etc.) rely on us being able to store all of the data in memory. This is a luxury we
程序代写代做 IOS algorithm C database go CS W186 Read More »
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
程序代写代做 IOS algorithm C database go CS W186 Read More »
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,
程序代写代做 algorithm database CS W186 Introduction to Database Systems Read More »
CS W186 Introduction to Database Systems Spring 2020 Josh Hug, Michael Ball DIS 9 1 Conflict Serializability (a) Draw the dependency graph (precedence graph) for the schedule. (b) Is this schedule conflict serializable? If so, what are all the conflict equivalent serial schedules? If not, why not? (c) Draw the dependency graph (precedence graph) for
程序代写代做 graph database CS W186 Introduction to Database Systems Read More »
CS W186 Introduction to Database Systems Spring 2020 Josh Hug, Michael Ball DIS 8 1 Parallel Query Processing 1. What is the difference between inter- and intra- query parallelism? 2. What are the advantages and disadvantages of organizing data by keys? 3. Assume for parts (a) and (b) that we have m=3 machines with B=5
程序代写代做 database CS W186 Introduction to Database Systems Read More »
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
程序代写代做 algorithm IOS concurrency graph C database CS 186/286 Fall 2017 Final Exam Read More »
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