Mis New Unit 1

MIS & DSSUNIT-I

DISHA TECHNICAL CAMPUS

INFORMATION TECHNOLOGY

BIPLAB BISWAS, 9713156563

ADVANTAGES OF IMPLEMENTATING I.T.


DISADVANTAGES OF IMPLEMENTATING I.T.


COMPUTER SCIENCE VS INFORMATION TECHNOLOGY


DATA BASE MANAGEMENT SYSTEM

Data Base: A structured set of Data or Database is a collection of data, typically describing the activities of one or more related organizations. Database might contain information about the following:

Entities Relationships

FUNCTIONS OF A DBMS

CAPABILITIES OF DBMS


DBMS- ADVANTAGES


DBMS- DISADVANTAGES


DATABASE ARCHITECTURE:

Database Architecture essentially describe the location of all the pieces of information that make up the database application. The database architecture can be broadly classified into two categories:


2-TIER ARCHITECTURE

The two-tier architecture is a client server architecture in which the client contains the presentation code and the SQL statement for data access. The database server processes the SQL statements and sends query results back to the client. The client or the first tier is primarily responsible for the presentation of data to the user and the server or the second tier is primarily responsible for supplying data servers to the client.


3-TIER ARCHITECTURE

A three-tier or a multi tier architecture has client, server and database. Where the client request is sent to the server and the server in turn sends the request to the database. The database sends back the information/data required to the server which in turn sends it to the client.


DBMS VS FMS


DBMS FMS

No duplication of data is possible in DBMS.

Duplication of data is occur in FMS.

The concept of Data Independence is available in DBMS.

The concept of Data Independence is not available in FMS.

In DBMS the security level is high In FMS the security is low.

The problem of data redundancy is not in DBMS.

In FMS the problem of data redundancy is there.

In DBMS large amount of data can be stored.

In FMS large amount of data can not be stored.

DBMS VS FMS


DBMS FMSDatabase object oriented database approach.

Traditional does not provide object oriented database system

Multiple users can share the data from a single database simultaneously.

Multiple users can not share the data from a single file.

In database approach, a single repository of data is maintained and accessed by many users.

In traditional file processing system the application is developed for a specific purpose and they will access specific database only.

DBMS VS FMS


DATA MODELS


HIERARCHICAL MODEL:

Hierarchical databases organize data under the premise of a basic parent/child relationship.

Each parent can have many children But each child can only have one parent Are fast and simple Inflexible as the relationship is restricted to one-to-many.


NETWORK DATA MODEL:

Data model that creates relationships among data in which subordinate records can be linked to more than one data element.

Another way:Network data model organize data as a network and the network model

allows each record to have multiple parent and child records.


RELATIONAL DATA MODEL

Data model based on the simple concept of tables in order to capitalize on characteristics of rows and columns of data.

Relations: The tables of rows and columns used in a relational database.

Tuple: A row of data in the relational database model. Attribute: A column of data in the relational database.

Another way:

A relational database allows the definition of data structures, storage and retrieval operations and integrity constraints. In

such a database the data and relations between them are organized in tables.


RELATIONAL DATA MODEL


SYSTEM THINKING


SYSTEM CHARACTERISTICS


Dining Room

Storage Office

Kitchens

Contour

Boundary

Inputs:Food,labor,cash,etc.

Outputs:Prepared food

TrashEtc.

Environments: customers, food distribution, banks, etc.

A fast food restaurant as a system: Example


OPEN AND CLOSED SYSTEMS


SYSTEM DEVELOPMENT LIFE CYCLE


Feel free to clear your

doubts.


Mis New Unit 1

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