ch1 - Chapter1:Introduction ,5thEd...

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  Database System Concepts, 5th Ed . ©Silberschatz, Korth and Sudarshan See  www.db-book.com  for conditions on re-use  Chapter 1:  Introduction Chapter 1:  Introduction
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©Silberschatz, Korth and Sudarshan 1.<number> Database System Concepts - 5 th  Edition, May 23,  2005 Chapter 1:  Introduction Chapter 1:  Introduction Purpose of Database Systems View of Data Database Languages Relational Databases Database Design Object-based and semistructured databases Data Storage and Querying Transaction Management Database Architecture Database Users and Administrators Overall Structure History of Database Systems
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©Silberschatz, Korth and Sudarshan 1.<number> Database System Concepts - 5 th  Edition, May 23,  2005 Database Management System (DBMS) Database Management System (DBMS) DBMS contains information about a particular enterprise Collection of interrelated data Set of programs to access the data  An environment that is both  convenient  and  efficient  to use Database Applications: Banking: all transactions Airlines: reservations, schedules Universities:  registration, grades Sales: customers, products, purchases Online retailers: order tracking, customized recommendations Manufacturing: production, inventory, orders, supply chain Human resources:  employee records, salaries, tax deductions Databases touch all aspects of our lives
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©Silberschatz, Korth and Sudarshan 1.<number> Database System Concepts - 5 th  Edition, May 23,  2005 Purpose of Database Systems Purpose of Database Systems In the early days, database applications were built directly on top of  file systems Drawbacks of using file systems to store data: Data redundancy and inconsistency Multiple file formats, duplication of information in different files Difficulty in accessing data  Need to write a new program to carry out each new task Data isolation — multiple files and formats Integrity problems Integrity constraints  (e.g. account balance > 0) become  “buried” in program code rather than being stated explicitly Hard to add new constraints or change existing ones
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©Silberschatz, Korth and Sudarshan 1.<number> Database System Concepts - 5 th  Edition, May 23,  2005 Purpose of Database Systems (Cont.) Purpose of Database Systems (Cont.) Drawbacks of using file systems (cont.)  Atomicity of updates Failures may leave database in an inconsistent state with partial  updates carried out Example: Transfer of funds from one account to another should  either complete or not happen at all Concurrent access by multiple users
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This note was uploaded on 04/28/2010 for the course CSE cse123 taught by Professor Benny during the Spring '10 term at LSU Eunice.

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ch1 - Chapter1:Introduction ,5thEd...

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