Chapters Chapter 1: Introduction to Databases

Transcription

1 Chapters Chapter 1: Introduction to Databases Accompanying website for text: MySQL began as we know it in 1996 o Truly started in 1979 and has evolved ever since 4GL o SQL MySQL Database terminology (3-5) o DBMS / RDBMS o Database table/file record/record set attribute/field Query -- SQL -- result set MySQL o Server side where database is stored, managed, and accessed o Client side where we typically work to access the data and associated database objects o Based on GPL (general public license) Code is available to all Free but with limitations o Built upon 3 fundamental principles Speed (performance) Time to get-translate-execute-respond Because of threads (7-8) o Allows multiple concurrent access to database o Code tree is structured in modular multi-layered manner o Focused on data and query optimization Reliability Extensive in-house testing Results available on line Xerox, NASA, Google, Sony Ease of Use Easy to get started Command line interface crude Many 3 rd party apps (Administrator & Query Browser) In addition: Multi-User support

2 Chapter 2: A Technical Tour of MySQL o Multiple clients can access one ore more databases simultaneously Scalability o Favorite of web developers for its capacity o concurrent users with no noticeable performance loss Portability o Developed on Unix but runs comfortably on many platforms ANSI compliance o Supports ANSI99 standard o Still has some dialect differences International community Wide based application support Open Source code with enthusiastic support community o How MySQL works o Based on tiered architecture o 5 primary subsystems Query engine Syntax parser o Decomposes sql it receives into format understood by MySQL Query optimizer o Streamlines syntax and prepares the most efficient plan of action based on index availability Execution component o Uses probability based induction to find quickest way to process o You have ability to override the plan if you know best index path Storage manager Interfaces with OS to write data to disk Resides in a separate subsystem so it operates at a level of abstraction away from operating system QUERY CACHE o Stores results to be reused Buffer manager Holds memory cache to help avoid duplicate requests Stores new records while awaiting table/index availability Transaction manager Facilitates concurrency Locking issues

3 o Atomicity o Consistency o isolation o durability Recovery manager Keeps copies of data for security purposes / later use Chapter 3: MySQL Installation and Configuration o Getting software WebCT Downloads section Server 5.0 version Binary version for Windows MySQL website Many choices Multiple operating systems Source vs. Binary o New users binary is best Pre-compiled by MySQL o Why source? You want different options Trim down overhead Enable experimental features Modify source code Pages covers other than Windows binary install My install guide o Refers to book pages o Version 5.0 Wizard looks different than book example o Install the server database & Administrator Server first Administrator Console approach, easy to use Show around the tool Start & run Add yourself as user o See handout on CD Test MySQL o Command line 1 st prompt for root password o Administrator 2 nd SHOW DATABASES; USE mysql; SHOW TABLES;

4 WebCT: SELECT COUNT(*) FROM user; Run Class Script o Type in via command line o Catalog o Edit table Look at options o Test it USE class_sample; SELECT * FROM exams; UDF worm check o With security & Firewall you should be OK o Script to find it USE mysql; SHOW TABLES; SELECT * FROM func; o Time for the Query Browser Avoids command line See website, post after class Install Double click installer Hit next Accept the license agreement Next Next Choose Complete Install Install Finish Navigate and test sample SELECT for ClassSample Load Assign1 script File o Open script o Find script on your disk/system o Execute Run simple SELECT o File Change Default Schema o Use player table o SELECT fname, lname, salary; o Talk about Assignment 1 How these tables fit into ERD Keys, constraints Use ERD to see how future tables will fit in

5 o WebCT Links Explore the following links on my WebCT homepage Course Calendar o Assignment Due Dates o Quiz Dates o Exam Date Course Information o Syllabus Course Outline Activity Table Grading o Textbook o Announcements Class Notes and Examples o Chapter Outlines o Weekly Notes o Sample Scripts Assignments o Assignments o Scripts for Assignments Quizzes and Exams Downloads o MySQL version 5.0 o GUI tools Includes Administrator and Query Browser Reference o System Requirements o Install Guide o MySQL manual (pdf format) o Table of data types o Slammer Worm o UDF Worm Do the check after install Web Links o MySQL Website Products MySQL Database Server o Download Binaries & Source Developer Zone Customers