It Banking Dbms

7/30/2019 It Banking Dbms

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Database Management

System


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A database is a collection of logically related

information. Database Management is the task of maintaining

database so that information is readily available.

The software required to perform the task of

database management is called a database

management systems (DBMS).

DBMSs are designed to maintain large volumes of

data.


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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 touse

Database Applications:

Banking: 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 can be very large.


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Physical level: describes how a record (e.g., customer) is

stored.

Logical level: describes data stored in database, and the

relationships among the data.

typeinstructor= record

ID : string;

name : string;dept_name : string;

salary: integer;

end;

View level: application programs hide details of data types.Views can also hide information (such as an employees

salary) for security purposes.


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View of Data

An architecture for a database system


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SQL

SQL stands for Structured Query Language

SQL lets you access and manipulate databases

SQL Commands are divided into:

DDL

DML

Query


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Create table stu(int Regno,char s_name,char

sec,char address);

Insert into stu values(1001,abc,A,bang);

Select * from stu;

Select s_name,address from stu;

Select * from stu where s_name=abc;

Update stu set address=chennai where

slno=1001;


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DDL

Data Definition Language (DDL) statements are used to

define the database structure or schema. Some examples:

CREATE - to create objects in the database

ALTER - alters the structure of the database

DROP - delete objects from the database


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DML

Data Manipulation Language (DML) statements are used

for managing data within schema objects. Some examples:

SELECT - retrieve data from the database

INSERT - insert data into a table

UPDATE - updates existing data within a table

Query

Query is used to retrieve data using SELECT.


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P_Id LastName FirstName Address City

1 Kumar Rajesh Yalahanka Bangalore

2 T Hari Hebbal Chennai

3 Pai Mohan J P Nagar Bangalore

Database Tables

A

database most often contains one or more tables. Each table isidentified by a name (e.g. "Customers" or "Orders"). Tables contain

records (rows) with data.

Below is an example of a table called "Person":

The table above contains five columns (P_Id, LastName,

FirstName, Address, and City).


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Data must be secure and safe in database.

Unauthorized access harmful for data should

be avoided.

Data Protection Act 1984 consists two levelsUsers must follow some rules and regulations and

abide by them.

Data locked by password

SECURITY MEASURES


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Data Warehousing

Data warehouse integrates data from multiple data sources.

For example, Source A and Source B might have a different

way of identifying a product.

But in data warehouse there will be one way of identifying theproduct.

This large collection of data supports in management decision

making process.

The data in the data warehouse is time variant and non-volatile.


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Data Warehousing


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Data Mining

Data mining is a process of analyzing the data

from different perspective and summarizing it

into useful information.

This is used for increasing the business profits.


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Data Models

Data model is a way of storing and retrieving the data. There

are three different data models.

A data model is a collection of concepts that can be describe

the structure of a database.

The following are the three different data models:

o Hierarchical

o Network

o Relational


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Hierarchical

In this model, data is stored in the form of a tree. The data is

represented by parent-child relation ship.

For example, each batch is root and students of the batch will

be subordinates.

This model supports only one-to-many relationship between

entities.


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Network

Data is stored along with pointers, which specify the

relationship between entities.

This model is complex. It is difficult to understand both the

way data is stored and the way data is manipulated.

It is capable of supporting many-to-many relationship

between entities, which hierarchical model doesnt.


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Relational

This stores data in the form of a table. Table is a collection ofrows and columns.

Relational Database Management System (RDBMS)

A DBMS that is based on relational model is called as RDBMS.

Relational model represents data in the form a table. A tableis a two dimensional array containing rows and columns.

One of the reasons behind the success of relational model is

its simplicity.

It is easy to understand the data and easy to manipulate.


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In case of large database, not simply possible

to go through entire file and extract required

data.

RDBMS Newest approach

Files are arranged in some particular order

according to the requirements

Eg: - Customers File

Name A/CNo

Sex Age DOB Address

Email Mobile


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THANK YOU

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It Banking Dbms