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Data Base Concepts

Data Base Concepts. Lesson 6. Topics to cover. Advantages of Automated System Conceptualizing Data File Evolution of Database System Elements Of Database System DBMS & RDBMS Data Models Factors Determining Database Performance. 1. Advantages of Automated System.

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Data Base Concepts

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  1. Data Base Concepts Lesson 6 Introduction to Computers & MIS

  2. Topics to cover • Advantages of Automated System • Conceptualizing Data File • Evolution of Database System • Elements Of Database System • DBMS & RDBMS • Data Models • Factors Determining Database Performance

  3. 1. Advantages of Automated System • Cycle Time for Information retrieval can be reduced • Information can be stored for long period without deterioration • Data can be updated with small workforce • Centralised Storing of voluminous data is possible • Data redundancy can be minimised • Person independent systems possible

  4. Essentials of Computer Based Information System (CBIS) • Ability to store & retrieve information • Unique file name • Extension name to depict the file type • Program files - set of instructions

  5. 2. Conceptualizing Data File Item_Detail Table or Data File Records or Tuples Fields or Attributes

  6. Item_Detail Supplier_Detail Sales Data Base Tables Customer_Detail

  7. Components of Database • Field/Attributes • Meaningful transaction details. No. of fields is known as the degree of the Table • Records /Tuples • The rows of a table describing the details of a transaction. No. of rows determines the cardinality of a table • Tables • Collection of relevant records • Database • Collection of related Tables

  8. Data Base Management System • Collection of interrelated Data • Set of programs to control • the organization • Storage & retrieval

  9. Features • Add, Modify, Delete, Extract data from a database • Provide an environment which is convenient & efficient to use • A system which provides safety of the data stored from unauthorized use and in event of system crashing.

  10. Elements of Data Base • Database • Tables • Queries • Forms • Reports • Macros • Modules • Relationship

  11. 3. Evolution of Database System • Late 1950s & Early 1960s • Flat files organised using sequential method • Physical & Logical data structures were identical • Data redundancy very high • 1st DBMS designed by Bachman in 1964

  12. 3. Evolution of Database System • Late 1960s • Direct Access & Random Access Files Introduced • Physical data independence became possible • 1970s • Database concepts gained popularity • Multiple views from same physical data • Redundancy controlled • Relational Database Model & Normalization procedures were developed • ER Model introduced • Query Language Developed

  13. 3. Evolution of Database System • 1980s & 1990s • Relational Database introduced -DB2 by IBM • Microcomputer products developed • Client-Server RDBMS gained popularity – ORACLE & SYBASE • Object oriented Database Management System introduced

  14. 3. Evolution of Database System • Current Trend • Distributed DBMS, • Expert DBMS • Object Oriented DBMS • Extensible DBMS

  15. 3. Evolution of Database System • Late 1950s & Early 1960s • Flat files organised using sequential method • Physical & Logical data structures were identical • Data redundancy very high • 1st DBMS designed by Bachman in 1964

  16. 4. Elements Of Database System

  17. 5. DBMS & RDBMS

  18. 6. Data Models

  19. 7. Factors Determining Database Performance

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