Oracle Database is a multi-model database management system produced and marketed by Oracle Corporation. It is the world's most popular database for running online transaction processing, data warehousing and mixed database workloads.
An Oracle database is a collection of data treated as a unit. The purpose of a database is to store and retrieve related information. A database server is the key to solving the problems of information management. In general, a server reliably manages a large amount of data in a multiuser environment so that many users can concurrently access the same data. All this is accomplished while delivering high performance. A database server also prevents unauthorized access and provides efficient solutions for failure recovery.
Oracle Database is the first database designed for enterprise grid computing, the most flexible and cost effective way to manage information and applications. Enterprise grid computing creates large pools of industry-standard, modular storage and servers. With this architecture, each new system can be rapidly provisioned from the pool of components. There is no need for peak workloads, because capacity can be easily added or reallocated from the resource pools as needed.
The database has logical structures and physical structures. Because the physical and logical structures are separate, the physical storage of data can be managed without affecting the access to logical storage structures.
The DBMS with Oracle Syllabus will be as follows…..
Applets execute under the control of a web browser. Netscape and Internet Explorer impose a security restriction, that prohibits access to the local filesystem by applets. While this may cause frustration for developers, this is an important security feature for the end-user. Without it, applets would be free to modify the contents of a user's hard-drive, or to read its contents and send this information back over a network.
Digitally signed applets can request permission to access the local filesystem, but the easiest way around the problem is to read and write to remote files located on a network drive. For example, in conjunction with a CGI script or servlet, you could send HTTP requests to store and retrieve data.
Custom graphical components can be created by producing a class that inherits from java.awt.Canvas. Your component should override the paint method, just like an applet does, to provide the graphical features of the component.
This is a very common question - after all, there aren't any SocketReaders, or PipedReaders. You need something to bridge the gap between a Reader, and an InputStream. That's where InputStreamReader comes into play.
InputStreamReader is a reader that can be connected to any InputStream - even filtered input streams such as DataInputStream, or BufferedInputStream. Here's an example that shows InputStreamReader in action.
// Connect a BufferedReader, to an InputStreamReader which is connected to
// an InputStream called 'in'.
BufferedReader reader = new BufferedReader ( new InputStreamReader ( in ) );
You can do the same with an OutputStream to a Writer (see OutputStreamWriter for more information).
The most common mechanism for this is the callback, where one class calls the method of another to notify it of an action or event. The class to be notified defines methods that will respond to specific events, such as when a mouse is clicked, dragged, or released. The AWT makes heavy use of this, with Listener interfaces. A class implements the event handling methods of a listener, and can then be registered with a component that generates these types of events. Classes that are event sources provide methods which register a listener, and at a later time when the event is generated, will invoke listener methods. The Abstract Windowing Toolkit (AWT) and Swing APIs would be a good place to start, to see if this suits your needs.
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