PPT-CS 142 Lecture Notes: Relational Databases

Slide 1 Relation Table name birth gpa grad Anderson 19871022 39 2009 Jones 1990416 24 2012 Hernandez 1989812 31 2011 Chen 199024 32 2011 VARCHAR30 DATE FLOAT. Also formal definitions of insertion anomaly and deletion anomaly are presented It is shown that a schema is in DKNF if and only if it has no insertion or deletion anomalies Unlike previously defined normal forms DKNF is not defined in terms of trad Slide . 1. <. p>Sample . <b>bold</b> display</p>. P. B. #text. #text. nextSibling. prevSibling. nextSibling. prevSibling. firstChild. lastChild. parentNode. parentNode. parentNode. Slide . 1. Relation (Table). name. birth. gpa. grad. Anderson. 1987-10-22. 3.9. 2009. Jones. 1990-4-16. 2.4. 2012. Hernandez. 1989-8-12. 3.1. 2011. Chen. 1990-2-4. 3.2. 2011. VARCHAR(30). DATE. FLOAT. Seminar: Transaction Processing (Bachelor). SS 2009. Dennis . Stratmann. Outline. Goal and Overview. Examine Three Approaches to CC on RD:. 1. Predicate-Oriented Concurrency Control. 2. Relational Update Transactions. \n\b 
 \n    \b\b ŽŽŽŽŽŽŽ Chapter . 4. 4. -1. Learning Objectives. Explain the importance and advantages of databases, as well as the difference between database and file-based legacy systems.. Explain the difference between logical and physical views of a database.. Nothing is so practical as a good theory. Kurt Lewin, 1945. The relational model. Overcame shortcomings of earlier database models. Has a strong theoretical base. Codd was the major developer. Problems with other models. Slide . 1. Unsafe Server Code. advisorName. = . params. [:form][:advisor]. students = . Student.find_by_sql. (. "SELECT students.* " +. "FROM students, advisors " +. "WHERE . student.advisor_id. Slide . 1. CSS Rule. body {. font-family: Tahoma, Arial, sans-serif;. color: black;. background: white;. margin: 8px;. }. Selector. Declaration. Block. Attribute Name. Value. CS 142 Lecture Notes: CSS. An . entity. is anything about which the organization wishes to store data. At your college or university, one entity would be the student.. STUDENTS. Student ID. Last Name. First Name. Phone Number. Slide . 1. Google Datacenter. CS 142 Lecture Notes: Datacenters. Slide . 2. Datacenter Organization. Rack:. 50 machines. DRAM: 200-800GB @ 300 . µs. Disk: 100TB @ 10ms. Single server:. 4-8 cores. DRAM: 4-16GB @ 100ns. Cse 344 May 7 th – Exam Review Examination Stations Exam Wednesday 9:30-10:20 One sheet of notes, front and back Practice solutions out after class Good luck! Exam Length Production v. Verification Slide . 1. Basic Ruby Syntax. sum = 0. i. = 1. while. . i. <= 10 . do. sum += . i. *. i. . i. = . i. + 1. end. puts "Sum of squares is #{sum}\n". Newline is statement separator. do ... end. Slide . 1. Basic Ruby Syntax. sum = 0. i. = 1. while. . i. <= 10 . do. sum += . i. *. i. . i. = . i. + 1. end. puts "Sum of squares is #{sum}\n". Newline is statement separator. do ... end.