Technology / Relational Database Management System

Relational Database Management System

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Autor:  anton  16 October 2010
Tags:  Relational,  Database,  Management,  System
Words: 1093   |   Pages: 5
Views: 547

Relational Database Management System

Oracle provides a flexible RDBMS called Oracle7. Using its features, you can store and manage data with all the advantages of a relational structure plus PL/SQL, an engine that provides you with the ability to store and execute program units. The server offers the options of retrieving data based on optimization techniques. It includes security features that control how a database is accessed and used. Other features include consistency and protection of data through locking mechanisms.

Oracle applications may run on the same computer as the Oracle Server. Alternatively, you can run applications on a system local to the user and run the Oracle Server on another system (client-server architecture). In this client-server environment, a wide range of computing resources can be used. For example, a form-based airline reservation application can run on a client personal computer while accessing flight data that is conveniently managed by an Oracle Server on a central computer

About Oracle8

Oracle8 is the first object-capable database developed by Oracle. It extends the data modeling capabilities of Oracle7 to support a new object relational database model. Oracle8 provides a new engine that brings object-oriented programming, complex datatypes, complex business objects, and full compatibility with the relational world.

Oracle8 extends Oracle7 in many ways. It includes several features for improved performance and functionality of online transaction processing (OLTP) applications, such as better sharing of runtime data structures, larger buffer caches, and deferrable constraints. Data warehouse applications will benefit from enhancements such as parallel execution of insert, update, and delete operations; partitioning; and parallel-aware query optimization. Operating within the Network Computing Architecture (NCA) framework, Oracle8 supports client-server and Web-based applications that are distributed and multitiered.

Oracle8 can scale tens of thousands of concurrent users, support up to 512 petabytes, and can handle any type of data, including text, spatial, image, sound, video, and time series as well as traditional structured data.

About Oracle8i

Oracle8i, the database for Internet computing, provides advanced tools to manage all types of data in Web sites.

It is much more than a simple relational data store. The Internet File System (iFS) combines the power of Oracle8i with the ease of use of a file system. It allows users to move all of their data into the Oracle8i database, where it can be stored and managed more efficiently. End users can easily access files and folders in Oracle iFS via a variety of protocols, such as HTML, FTP, and IMAP4, giving them universal access to their data.

Oracle8i interMedia allows users to web-enable their multi-media data—including image, text, audio, and video data. Oracle8i includes a robust, integrated, and scalable Java Virtual Machine within the server (Jserver), thus supporting Java in all tiers of applications. This eliminates the necessity of recompiling or modifying Java code when it is to be deployed on a different tier.

With the newly introduced resource management, the DBA can choose the best method to fit an application’s profile and workload. The extended features of parallel server and networking improves ease of system administration. The extended functionality of advanced replication results in better performance and improved security. Significant new functionalities have been added to languages.

Oracle8i provides full, native integration with Microsoft Transaction Server (MTS) in the Windows NT environment. Application development is simplified by the Oracle Application Wizard (AppWizard) for Visual Studio, which provides developers with a GUI tool for creating a Visual C++, Visual Interdev, or Visual Basic applications accessing data in an Oracle database.

Oracle Internet Platform

Oracle offers a comprehensive high-performance Internet platform for e-commerce and data warehousing. This integrated platform includes everything needed to develop, deploy, and manage Internet applications. The Oracle Internet Platform is built on three core pieces:•Browser-based clients to process presentation

•Application servers to execute business logic and serve presentation logic to browser-based clients

•Databases to execute database-intensive business logic and serve data

Oracle offers a wide variety of the most advanced graphical user interface (GUI) driven development tools to build business applications, as well as a large suite of software applications for many areas of business and industry. Stored procedures, functions, and packages can be written by using SQL, PL/SQL, or Java.

SQL Statements

Oracle SQL complies with industry-accepted standards. Oracle Corporation ensures future compliance with evolving standards by actively involving key personnel in SQL standards committees. Industry-accepted committees are the American National Standards Institute (ANSI) and the International Standards Organization (ISO). Both ANSI and ISO have accepted SQL as the standard language for relational databases.

About PL/SQL

Procedural Language/SQL (PL/SQL) is Oracle Corporation’s procedural language extension to SQL, the standard data access language for relational databases. PL/SQL offers modern software engineering features such as data encapsulation, exception handling, information hiding, and object orientation, and so brings state-of-the-art programming to the Oracle Server and Toolset.PL/SQL incorporates many of the advanced features made in programming languages designed during the 1970s and 1980s. It allows the data manipulation and query statements of SQL to be included in block-structured and procedural units of code, making PL/SQL a powerful transaction processing language. With PL/SQL, you can use SQL statements to finesse Oracle data and PL/SQL control statements to process the data.

PL/SQL Engine and the Oracle Server

PL/SQL is not an Oracle product in its own right; it is a technology employed by the Oracle Server and by certain Oracle tools. Blocks of PL/SQL are passed to and processed by a PL/SQL engine, which may reside within the tool or within the Oracle Server. The engine used depends on where the PL/SQL is being invoked.

When you submit PL/SQL blocks from a Pro* program, user-exit, SQL*Plus, or Server Manager, the PL/SQL engine in the Oracle Server processes them. It separates out the SQL statements and sends them individually to the SQL statements executor.

A single transfer is required to send the block from the application to the Oracle Server, thus improving performance, especially in a client-server network. PL/SQL code can also be stored in the Oracle Server as subprograms that can be referenced by any number of applications connected to the database.

Summary

Relational database management systems are composed of objects or relations. They are managed by operations and governed by data integrity constraints.

Oracle Corporation produces products and services to meet your relational database management system needs. The main product is the Oracle Server, which enables you to store and manage information by using SQL and the PL/SQL engine for procedural constructs.

SQL

The Oracle Server supports ANSI standard SQL and contains extensions. SQL is the language used to communicate with the server to access, manipulate, and control data.

PL/SQL

The PL/SQL language extends the SQL language by offering block-structured procedural constructs combined with SQL nonprocedural capabilities.



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