company logo database system i gde dharma n. fenomena “information overload” “the percentage...
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Company
LOGO
Database System
I Gde Dharma N
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Fenomena “Information Overload”
“The percentage of unstructured data is 85% of the total and
growing..”---Delphi Group Survey, 2008
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Data VS Information :What is the difference?
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What is Data?
Data can be defined in many ways.Data is a collection of facts, such as
values or measurements.Data can be defined in many ways.
Information science defines data as unprocessed information.
It can be numbers, words, measurements, observations or even just descriptions of things.
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What is Information?
Information is data that have been organized and communicated in a coherent and meaningful manner.
Data is converted into information, and information is converted into knowledge.
Knowledge; information evaluated and organized so that it can be used purposefully.
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Universe of Discourse
A database is a model of some aspect of the reality of an organisation.
It is conventional to call this reality a universe of discourse (UoD), or a domain of discourse.
Universe ofDiscourse
Database Design Database Scheme
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What is Database?
A Database is any collection of data.Models a real-world enterpriseA DBMS is a software system designed to
maintain a database.We use a DBMS when
there is a large amount of data security and integrity of the data are important many users access the data concurrently
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Factbases Datum
PersistenceIntensional dan Extensional PartsIntegrity
Redudancy Transactions Integrity Constraints
Nature of Database
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Data Model
Hierarchy Data ModelNetwork Data ModelRelational Data Model
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DBMS Approach
Top-Down Approach, start making database with planning stage. Example : Entity Relationship Diagram.
Bottom-Up Approach, used to transform from traditional system or form to database.
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Why use a DBMS?
Without a DBMS, we’d have :
Data stored as bits on disk organized as files
Access by a collection of ad hoc programs
Users of the data
There is no control or coordination of what
these program do with the data
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Why use a DBMS?
With a DBMS, we have :
Data stored as bits on disk organized as files
Application
Users of the data
DBMS provide control and coordination to
protect the data.
DBMS
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DBMS Advantage
High Performance for large data.Data Integrity.Data Independence.Centralization of data.Data Security more flexible.
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Main Component of Database
HardwareSoftwareDataUser
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Layers of Data Abstraction
View 1 View 2 View 3
Conceptual Schema / Internal Schema / Logical Schema
DatabaseFile
External Layer
Logical Layer
Physical Layer
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Functional Component of Database
Database ManagerFile ManagerDisk Manager
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Database Development Life Cycle
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Thank you for your attention.
Any Question?????