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would wait for a reply message to be returned across the network. If a logical transaction required six SQL operations, six network round trips were required. With stored procedures, the sequence of six SQL operations could be programmed into a procedure and stored in the database. The application program would simply request the execution of the stored procedure and await the results. In this way, six network round trips could be cut to one round trip the request and reply for executing the stored procedure. Stored procedures proved to be a natural fit for the client/server model, and Sybase used them to establish an early lead with this architecture. A competitive response quickly followed from many of the other DBMS vendors. Today, most enterprise DBMS products provide a stored procedure capability, and the benefits of stored procedures in corporate databases has expanded considerably beyond the early focus on network performance. Stored procedures are less relevant for other types of specialized DBMS systems, such as data warehousing systems or in-memory databases. Some DBMS products have modeled their SPL structures on C or Pascal language constructs. Others have tried to match the style of the SQL Data Manipulation Language (DML) and Data Definition Language (DDL) statements. As a result, while stored procedure concepts are very similar from one SQL dialect to another, the specific syntax varies considerably.

To understand how a Fresnel lens is constructed and works, we are going to need to do a little thought experiment. Picture this. You have a glass lens which is flat on one side, and round on the other. We are now going to use a tool to remove material from the center point of the lens. The tool has a flat end. We are going to remove material until the corners of the flat-ended tool just begin to penetrate the round surface. We are now going to use another larger tool to remove material from a circle around the last. We are going to do this until the tool just starts to break through the surface. We are going to keep doing this with progressively larger tools until we are left with a hollowed lens. If you were to look at the inside of this lens, what you would see is a series of flat steps cut in concentric circles. Now imagine flattening out these concentric circles so that they all lay in the same plane. What you have constructed in your mind is a Fresnel lens. Take a look at Figure 8-19, it shows how a Fresnel lens is simply a normal lens with the unnecessary glass removed and flattened. It is important to note, that although Fresnel lenses tend

It s easiest to explain the basics of stored procedures through an example. Consider the process of adding a customer to the sample database. Here are the steps that may be involved: 1. Obtain the customer number, name, credit limit, and target sales amount for the customer, as well as the assigned salesperson and office. 2. Add a row to the customer table containing the customer s data. 3. Update the row for the assigned salesperson, raising the quota target by the specified amount. 4. Update the row for the office, raising the sales target by the specified amount. 5. Commit the changes to the database, if all were successful. Without a stored procedure capability, here is a SQL statement sequence that does this work for XYZ Corporation, new customer number 2137, with a credit limit of $30,000 and first-year target sales of $50,000 to be assigned to Paul Cruz (employee #103) of the Chicago office:

INSERT INTO VALUES UPDATE SET WHERE CUSTOMERS (CUST_NUM, COMPANY, CUST_REP, CREDIT_LIMIT) (2137, XYZ Corporation , 103, 30000.00); SALESREPS QUOTA = QUOTA + 50000.00 EMPL_NUM = 103;

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