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In 1988, IBM jumped on the relational OLTP bandwagon with DB2 Version 2, with benchmarks showing the new version operating at over 250 transactions per second on large mainframes. IBM claimed that DB2 performance was now suitable for all but the most demanding OLTP applications and encouraged customers to consider it as a serious alternative to IMS. OLTP benchmarks became a standard sales tool for relational databases, despite serious questions about how well the benchmarks actually measure performance in real applications. The suitability of SQL for OLTP improved dramatically over the next decade, with advances in relational technology and more powerful computer hardware both leading to ever-higher transaction rates. DBMS vendors started to position their products based on their OLTP performance, and for a few years database advertising focused almost entirely on these performance benchmark wars. A vendor-independent organization, the Transaction Processing Council, jumped into the benchmarking fray with a series of vendorindependent benchmarks (TPC-A, TPC-B, and TPC-C), which only served to intensify the performance focus of the vendors. By the early 2000s, SQL-based relational databases on high-end UNIX-based database servers evolved well past the 1000-transactions-per-second mark. Client/server systems using SQL databases have become the accepted architecture for implementing OLTP applications. From a position as unsuitable for OLTP, SQL has grown to be the industry standard foundation for building OLTP applications.

SQLPrepare ( hstmt, "DELETE FROM CD_INVENTORY WHERE CD_ID = ", SQL_NTS );

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The dramatic growth of PC LANs through the 1980s and 1990s created a new opportunity for departmental or workgroup database management. The original database systems focused on this market segment ran on IBM s OS/2 operating system. In fact, SQL Server, now a key part of Microsoft s Windows strategy, originally made its debut as an OS/2 database product. In the mid-1990s, Novell also made a concentrated effort to make its NetWare operating system an attractive workgroup database server platform. From the earliest days of PC LANs, NetWare had become established as the dominant network operating system for file and print servers. Through deals with Oracle and others, Novell sought to extend this leadership to workgroup database servers as well. The arrival of Windows NT, a specialized version of Windows tuned for server use, was the catalyst that caused the workgroup database market to really take off. While NetWare offered a clear performance advantage over NT as a workgroup file server, NT had a more robust, general-purpose architecture, more like the minicomputer operating systems. Microsoft successfully positioned NT as a more attractive platform for running workgroup applications (as an application server) and workgroup databases. Microsoft s own SQL Server product was marketed (and often bundled) with NT as a tightly integrated workgroup database platform. Corporate information systems departments were at first very cautious about using relatively new and unproven technology, but the NT/SQL Server combination allowed departments and non-IS executives to undertake smaller-scale, workgroup-level projects on their own, without corporate IS help. This phenomenon, like the grassroots support for personal computers a decade earlier, fueled the early growth of the workgroup database segment.

Part I:

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The embedded SQL development cycle may seem cumbersome, and it is more awkward than developing a standard C or COBOL program. In most cases, all of the steps in Figure 17-3 are automated by a single command procedure, so the individual steps are

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Notice that a question mark is used to indicate the position of the variable. The question mark is used in place of the host variable. This is often called a placeholder. Once you ve prepared your SQL statement, you must now bind the host variable to the statement. To do so in a C program, you must use a BindParameter( ) function that identifies the statement handle, the position of the host variable within the SQL statement, the name of the host variable, and a number of other arguments, as shown in the following example:

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