1 Introduction to Data Science Lecture 17 Apache Spark, Amazon DynamoDB CIS 5930/4930 – Fall 2021 Assignments CIS 5930/4930 – Fall 2021 • Homework 3 • Posted on Canvas 10/14 • Due 10/21 3pm on Canvas Spark • Fast and expressive cluster computing system interoperable with MapReduce/Hadoop • Improves performance (orders of magnitude faster) – […]
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8/30/2021 1 Introduction to Data Science Lecture 3 Structured Data CIS 5930/4930 – Fall 2021 Course Staff • Instructor – Michael Gubanov – .edu – OH: Wed 1.00-2.15pm (online) • TA – Md Muhib Khan – .edu – OH: Mon 10-11am, Fri 5-6pm CIS 5930/4930 – Fall 2021 Exam • One Midterm exam – Proctored,
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Query Optimisation Query Optimisation In practice, query optimisers incorporate elements of the following three optimisation approaches: Semantic query optimisation Use application specific semantic knowledge to transform a query into the one with a lower cost (they return the same answer). Rule-based query optimisation Use heuristic rules to transform a relational algebra expression into an equivalent
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Introduction to Database Systems – Part 1 General Concepts What is a Database? Have you designed a database? Have you worked with a database? Definition of Databases A database is a collection of related data. Implicit properties: represents some aspects of the real world; a logically coherent collection of data; designed and built for a
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1/81 Week 3 Workshop 2/81 Housekeeping 1 Thank you again for providing us with your valuable feedback! 2 Refer to the post in Wattle News Forum for makeup information for the CECS teaching pause. 3 Assessment on SQL (Assignment 1) will be available on Wattle at 11:59pm on Aug 20 (Friday) and due at 11:59pm
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1/42 Week 10 Workshop – Database Transactions Designing Data-Intensive Applications, Martin Kleppmann, O’Reilly, 2015 2/42 Transactions A transaction is a sequence of database operations grouped together for execution as a logic unit in a DBMS. Steps Transaction BEGIN TRANSACTION 1 SELECT balance FROM ACCOUNT WHERE name = ’Steve’; 2 UPDATE ACCOUNT SET balance = balance-500
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SQL – Part 1 SQL and Data Definition Language What is SQL? SQL stands for Structured Query Language SQL was initially developed at IBM (SEQUEL → SQL), as one of the first commercial languages for the relational data model. 1986 – SQL was standardised by ANSI and ISO ( SQL-86). 1989 – SQL was revised
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COMP2400/6240 – Relational Databases SQL Sample Questions Due date: TBD Question 1 Unknown Marks The relational database moviedb has the following database schema: Movie(title, production year, country, run time, major genre) primary key : {title, production year} Person(id, first name, last name, year born) primary key : {id} Award(award name, institution, country) primary key :
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1/59 Week 8 Workshop – Query Processing and Optimisation 2/59 Housekeeping 1 Assignment 2 (Database Theory) for both COMP2400/6240 students: The submission deadline is 23:59, Oct 12, 2021. This assignment must be done individually (no group work). Please join the special drop-in sessions if you need any clarifications. 2 All the labs on Oct 4
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Relational Algebra (Part 1) Two Questions 1 What is the difference between procedural and declarative languages? 2 What is the foundation for relational query languages like SQL? Why Relational Algebra? SQL is a (fairly) declarative query language: SQL queries describe the set of tuples you want to get. To be efficiently implemented, SQL queries need
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