Database management in a three-tier Internet architecture in Software

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Database management in a three-tier Internet architecture
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An Overview of SQL
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device, such as smart phone, in the front-end tier. It communicates with a web server in the middle tier. When the user request is for something more complex than a simple web page, the web server passes the request to an application server, whose role is to handle the business logic required to process the request. Often the request will involve access to an existing (legacy) application running on a mainframe system or to a corporate database. These systems run in the back-end tier of the architecture. As with the client/server architecture, SQL is solidly entrenched as the standard database language for communicating between the application server and back-end databases. All of the packaged application server products provide a SQL-based callable API for database access. As much of the application server market has converged around the Java2 Enterprise Edition (J2EE) standard, Java Database Connectivity (JDBC) has emerged as the leading standard API for application server access to databases.
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The Proliferation of SQL
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As the standard for relational database access, SQL has had a major impact on all parts of the computer market. IBM s SQL-based DB2 dominates mainframe data management. Oracle s SQL-based database dominates the market for UNIX-based computer systems and servers. Microsoft s SQL Server dominates on server-oriented Windows operating systems for workgroups and departmental applications. MySQL dominates the open-source database market. SQL is accepted as a technology for online transaction processing (OLTP), fully refuting the conventional wisdom of the 1980s that relational databases would never offer performance good enough for transaction processing applications. SQL-based data warehousing and data mining applications are the standard for helping companies to discover customer purchase patterns and to offer better products and services. On the Internet, SQL-based databases are the foundation of more personalized products, services, and information services that are a key benefit of electronic commerce.
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Although IBM s hierarchical IMS database is still offered on IBM mainframes and still runs many high-performance mainframe applications, IBM s SQL-based DB2 has been its flagship mainframe database for more than two decades. IBM offers DB2 implementations across different computer systems architectures, but the mainframe DB2 is still the mother ship, generating the vast majority of IBM s database revenues. Any new database development on mainframe systems today uses DB2, cementing SQL s dominant role for mainframe data management.
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Minicomputers were one of the most fertile early markets for SQL-based database systems. Oracle and Ingres were both originally marketed on Digital s VAX/VMS minicomputer systems. Both products were subsequently ported to many other platforms. Sybase, a later database system specialized for online transaction processing, also targeted the VAX as one of its primary platforms. Through the 1980s, the minicomputer vendors also developed their own proprietary relational databases featuring SQL. Digital considered relational databases so important that it bundled a runtime version of its Rdb/VMS database with every VAX/VMS system.
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3:
SQL in Perspective
Hewlett-Packard offered Allbase, a database that supported both its HPSQL dialect and a nonrelational interface. Data General s DG/SQL database replaced its older nonrelational databases as DG s strategic data management tool. In addition, many of the minicomputer vendors resold relational databases from the independent database software vendors. These efforts helped to establish SQL as an important technology for midrange computer systems. By the mid-1990s, the minicomputer vendors SQL products had largely disappeared, beaten in the marketplace by multiplatform software from Oracle, Informix, Sybase, and others. Oracle acquired Digital s Rdb, and the other products were gradually dropped. Paralleling this trend, the importance of proprietary minicomputer operating systems faded, replaced by widespread use of UNIX on midrange systems. Yesterday s minicomputer SQL market has effectively become today s market for UNIX-based database servers based on SQL.
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