Database Management Data in organizations and the data management environment.

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    21-Dec-2015

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  • Slide 1
  • Database Management Data in organizations and the data management environment
  • Slide 2
  • Managing Data All the value of this company is in its people. If you burned down all our plants, and we just kept our people and our information files, we should soon be as strong as ever. Thomas Watson, Jr. Former chairman of IBM
  • Slide 3
  • Data, Information, & Knowledge Data Watson: raw, unsummarized, and unanalyzed facts. Information Watson: data that have been processed into a meaningful form. Knowledge Watson: the capacity to use information the expertise to make sense of information to interpret information and use it in decision making. Information is created from streams of data through the application of knowledge.
  • Slide 4
  • Data functions and impact through time o Data facilitate business events, such as transactions, in the present. o Data produced during prior events constitute an historical record of the past that can be summarized, explored, and analyzed for insights... o which, in turn, informs decision-making that shapes the future.
  • Slide 5
  • Desirable attributes: o shareable o transportable osecure oaccurate otimely orelevant Management of data Typical problems: o redundancy oinconsistency o lack of control oaccess problems -poor interfaces -long delays olack of richness olack of integration
  • Slide 6
  • Individual data management Internal memory is limited External memory extends internal memory
  • Slide 7
  • Calendar Organizing principles Set amount of space Ordering Rapid access 9 10 11 12 1 2 3 4 5 6 7 8 9 December 25, 1852 Staff Meeting Email Communication Project Planning Check lunch preparations Meeting with directory Vendor presentation Process paperwork Drive home Dinner Reading and relaxation 1803, The Expeditioner, London
  • Slide 8
  • Name Address Rudyard Kipling Name Address Name Address Name Address 1815, The Expeditioner, London PO Kyhber Pass Northwest Frontier India Jack London PO Klondike Alaska K-L K L Address book Organizing principles Pre-formatted storage space Ordering Rapid access
  • Slide 9
  • To do list Organizing principles Structure Rapid scan support To Be Done This Week Action List Explore Nile Write journal Shoot crocodile Unwrap mummy 1823, The Expeditioner, London
  • Slide 10
  • Organizational memory is supported by: o relational databases oother database technology - DBs based on older technology - object databases - spreadsheets - PDAs and cell phones - voicemail, email, groupware - on-line documents o paper records omulti-media artifacts oformal decision models oemployees brains oorganizational procedures and routines osystems applications (In data management, computer databases are just part of the picture ) (our focus)
  • Slide 11
  • Data management systems timeline 195019601970198019902000 File systems Hierarchical DBMS Network DBMS Relational DBMS Object-oriented DBMS
  • Slide 12
  • Flat File Database NameAddress CourseGrade Mark Freeman123 Main StEnglish 101B Mark Freeman123 Main StData StructureA Mark Freeman123 Main StPsych 101C Mary Smith413 Elm DrChemistry 200A Mary Smith413 Elm DrFrench 205B David Cole1009 10 th Apt BAccounting 102 A
  • Slide 13
  • Hierarchical Database
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  • Network Database
  • Slide 15
  • Network and Hierarchical Redundant Difficult to maintain Required system-level understanding of underlying data structures to access data Costly Labor Computer resources Time
  • Slide 16
  • Relational Databases E F Codd, 1970 Relational Relations = Grouping of related data (tables) Data stored only once Query language for accessing data Analysts no longer need know how data is stored! RDBMS (Relational Database Management System)
  • Slide 17
  • IT Org Chart CIO Operations Director Database Manager Database Administrator Data Center Manager System Administrator Network Administrator Support Manager Technical Support Application Support Application Development Database Architect Database Programmer
  • Slide 18
  • Information Technology Roles Database Administrator Manages day-to-day operations, install, upgrade, data backup recovery Data Architect Designs the database Works with a business analyst to choose what data to store and how to organize it Database Programmer Develops database applications: computer programs that allow users to retrieve and process data
  • Slide 19
  • Data Modeling Top-down approach Data Model Data Definition Database Table
  • Slide 20
  • The database development lifecycle (DDLC) and the Term Project Assignments Assignment 1: Data Model Assignment 1: Database Dictionary Assignment 2: Database Prototype Assignment 3: SQL Queries Completed by Instructor
  • Slide 21
  • Database Management Systems OLTP (Online Transaction Processing) Many transactions Short transactions Volatile data Decision Support Data Warehouse, Data Mining Fewer transactions Longer transactions Static data
  • Slide 22
  • Database Management System Design Design decisions have significant future impact Reliability Scalability Security

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