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Components of a typical database management system
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Introduction
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SQL is a database administration language. The database administrator responsible for managing a minicomputer or mainframe database uses SQL to define the database structure and to control access to the stored data. SQL is a client/server language. Personal computer programs use SQL to communicate over a network with database servers that store shared data. This client/server architecture is used by many popular enterprise-class applications. SQL is an Internet data access language. Internet web servers that interact with corporate data and Internet application servers all use SQL as a standard language for accessing corporate databases, often by embedding SQL database access within popular scripting languages like PHP or Perl. SQL is a distributed database language. Distributed database management systems use SQL to help distribute data across many connected computer systems. The DBMS software on each system uses SQL to communicate with the other systems, sending requests for data access. SQL is a database gateway language. In a computer network with a mix of different DBMS products, SQL is often used in a gateway that allows one brand of DBMS to communicate with another brand. SQL has thus emerged as a useful, powerful tool for linking people, computer programs, and computer systems to the data stored in a relational database.
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In historical terms, SQL has been an extraordinarily successful information technology. Think about the computer market in the mid-1980s, when SQL first started to become important. Mainframes and minicomputers dominated corporate computing. The IBM personal computer had been introduced only a few years before, and the MS-DOS command line was its user interface. IBM s mainframe operating systems and minicomputer operating systems from Digital Equipment, Data General, Hewlett-Packard, and others dominated business computing. Proprietary networking schemes like IBM s SNA or Digital Equipment s DECnet linked computers together. The Internet was still a tool for collaboration among research labs, and the World Wide Web had not yet appeared on the scene. COBOL, C, and Pascal were dominant computer languages; object-oriented programming was only beginning to emerge; and Java had not been invented. Across all of these areas of computer technology from computer hardware to operating systems to networking to languages the important key technologies of the mid-1980s have faded or become obsolete, replaced by significant new ones. But in the world of data management, the relational database and SQL continue to dominate the landscape. They have expanded over the years to support new hardware, operating systems, networks, and languages, but despite many attempts to dethrone them, the core relational model and the SQL have thrived and remain the dominant forces in data management. Here are some of the major features and market forces that have contributed to this success over the past 25 years: Vendor independence Portability across computer systems
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An Overview of SQL
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Official SQL standards Early IBM commitment Microsoft support Relational foundation High-level, English-like structure Interactive, ad hoc queries Programmatic database access Multiple views of data Complete database language Dynamic data definition Client/Server architecture Enterprise application support Extensibility and object technology Internet database access Java integration (JDBC) Open source support Industry infrastructure The sections that follow briefly describe each of these and how they contributed to SQL s success.
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Vendor Independence
SQL is offered by all of the leading DBMS vendors, and no new database product over the last decade has been highly successful without SQL support. A SQL-based database and the programs that use it can be moved from one DBMS to another vendor s DBMS with minimal conversion effort and little retraining of personnel. Database tools such as query tools, report writers, and application generators work with many different brands of SQL databases. The vendor independence thus provided by SQL was one of the most important reasons for its early popularity and remains an important feature today.
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