Java Forecast 4u

the java tutorial,java programing,servlet,jsp,Struts,hibernate tutorial,spring framework tutorial,ejb,jsf,log4j,Junit, java project,java interview questions

Component of Database System

♠ Posted by arbind sharma in
Basically there are four component of Data System:
1.    Data 
2.    Hardware
3.    Software
4.    Users  
Data
•Database systems are available in smaller or larger systems
Single-user system:
–System in which at most one user can access the database at any given time
Multi-user system:
–System in which many users can access the database at the same time
•Data in the database is both integrated and shared
Integrated:
–database is a unification of several distinct files
–The redundancy among the files are partially or wholly eliminated
Shared :
–Different users can have access to the same data
–I.e, database can be shared among different users

What is HTML?

♠ Posted by arbind sharma in
HTML (HyperText Markup Language) is the fragrance of the Internet. Hypertext means that some text in the HTML document carries a link to a different location, which can be on the same page or another page. On clicking this 'hot spot', the viewer is transferred to that location. Markup means that specific portions of a document are marked up to indicate how they should be displayed in the browser.

The main purpose of HTML is to describe the structure of a document. Formatting of HTML solely depends on the browser. It is well known that even different versions of the same browser do not display HTML alike. Structuring means describing different parts that make a document. The various parts of an HTML document can be tables, lists, links, blocks of text such as paragraphs etc. Though HTML was not designed for document layout, with the introduction of Cascading Style Sheets, HTML pages can now be formatted using many traditional design elements such as line spacing, kerning, character spacing, padding etc.

What is HyperText?

Hypertext means that some text in the HTML document carries a link to a different location. Such links can be present either on the same page or some other page located on another computer page. On clicking this 'hot spot', the viewer is transferred to that location.

What is Markup?
Markup means that specific portions of a document are marked up to indicate how they should be displayed in the browser.
HTML carries information about the web page though, the display of the document is solely dependent on the browser. For this reason, you should test your HTML code in the two most used browsers, Internet Explorer from Microsoft and Netscape Communicator from Netscape. With HTML you can embed various objects such as images, video, sound in your pages.

what Database systems?

♠ Posted by arbind sharma in

A Software that controls the 

--Organization 
--Storage 
--Retrieval
--Security
--Integrity

A database system is a computerized system whose overall purpose is to store information and to allow user to retrieve and update the information on demand. 

It accepts requests from the application program and instructs the operating system to fetch the desired data.


Files Vs databases

♠ Posted by arbind sharma in
Database
–a collection of data that is multidimensional
–internal links between its entries make the information accessible from a variety of perspectives
Flat File

– a traditional one-dimensional file storage system that presents its information from a single point of view


Functions of DBMS

♠ Posted by arbind sharma in

There are following functions of Database Management system:

Major Functions–Data Definition
–Data construction
–Data manipulation

Other functions–Data recovery
–Data security and integrity
–Data dictionary etc…