free barcode generator source code in vb.net AN OVERVIEW OF SQL in Software

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AN OVERVIEW 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 has adopted SQL as a unifying database technology for its product line. SQL-based databases dominate the market for UNIX-based computer systems. In the PC market, SQL databases on server-oriented Windows operating systems are mounting a serious challenge to the dominance of UNIX as a database processing platform, especially for departmental applications. 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 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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SQL has played a key role as a common database access language across all of IBM s computer families. Originally, this role was part of IBM s SAA strategy, announced in March 1987. Although IBM s grand goals for SAA were not achieved, the unifying role of SQL has grown even more important over time. The DB2 database system, IBM s flagship SQL-based DBMS, now runs on a broad range of IBM and non-IBM computer systems, including: I Mainframes. DB2 started as the SQL standard-bearer for IBM mainframes running MVS and has now replaced SQL/DS as the relational system for the VM and VSE mainframe operating systems. I AS/400. This SQL implementation runs on IBM s family of midrange business systems, targeted at small- and medium-sized businesses and server applications. I Power-architecture servers. DB2 runs under the UNIX operating system on IBM s family of RISC-based workstations and servers, for engineering and scientific applications, and as IBM s own UNIX database server platform. I Other UNIX platforms. IBM supports DB2 on UNIX-based server platforms from Sun Microsystems and Hewlett-Packard, the two largest UNIX system vendors, and on UNIX-based workstations from Silicon Graphics. I Windows. A PC-LAN server version of DB2 competes with Microsoft SQL Server, Oracle, and others on Windows-based database servers.
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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 have since been ported to many other platforms. Sybase, a later
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3:
SQL in Perspective
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. 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. Accompanying this trend, the importance of proprietary minicomputer operating systems has faded as well, 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.
AN OVERVIEW OF SQL
SQL on UNIX-Based Systems
SQL has firmly established itself as the data management solution of choice for UNIX-based computer systems. Originally developed at Bell Laboratories, UNIX became very popular in the 1980s as a vendor-independent, standard operating system. It runs on a wide range of computer systems, from workstations to mainframes, and has become the standard operating system for high-end server systems, including database servers. In the early 1980s, four major databases were already available for UNIX systems. Two of them, Ingres and Oracle, were UNIX versions of the products that ran on DEC s proprietary minicomputers. The other two, Informix and Unify, were written specifically for UNIX. Neither of them originally offered SQL support, but by 1985, Unify offered a SQL query language, and Informix had been rewritten as Informix-SQL, with full SQL support. Today, the Oracle, DB2, Informix, and Sybase DBMS products dominate the UNIXbased database market and are available on all of the leading UNIX server platforms. UNIX-based database servers are a mainstream building block for both client/server and three-tier Internet architectures. The constant search for higher SQL database performance has driven some of the most important trends in UNIX system hardware. These include the emergence of symmetric multiprocessing (SMP) as a mainstream server architecture, and the use of RAID (Redundant Array of Independent Disks) technology to boost I/O performance.
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