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Notes Includes cost of setting up a new user (hardware, software, and network). Does not include price of memory. Covers training of users on operating system and basic application usage. Based on storage used by department members. The total annual cost of maintaining a database server will be divided among the users of the system.

Figure 14-4

The 1980s and 1990s saw the explosion of a new, client/server model for database access, in which a user on a personal computer or an application program accessed a database on a separate computer system using a network In the late 1990s, the increasing popularity of the Internet and the World Wide Web intertwined the worlds of networking and data management even further Now users require little more than a web browser to access and interact with databases, not only within their own organizations, but around the world Today, database management is very big business Independent software companies and computer vendors ship billions of dollars worth of database management products every year Computer industry experts say that mainframe and minicomputer database products each account for about 10 to 20 percent of the database market, and personal computer and server-based database products account for 50 percent or more.

relationships. The circle on the left corresponds to customer assignments; the circle on the right corresponds to orders. Each is represented by its own star. The table beneath the Venn diagram illustrates the different ways these sets can be compared. The first example represents a set in which sales management may be particularly useful: salespeople who did not sell to assigned customers. This set is defined by the SQL MINUS operation, as in the query from 12. Precomputed results can be stored in a factless fact table, with dimensions for the period, salesperson, and customer. The derived table can also be computed by adding a NOT EXISTS predicate to a query for customer assignments; these SQL keywords will introduce a correlated subquery that looks for orders. See 12 for the full story. Additional set operations are also possible. The intersection of the two sets represents sales to assigned customers. This set may be computed and stored in a fact table that includes the same facts as order_facts. If salespeople are only compensated for sales to their assigned customers, this fact table will be useful for commission reporting. The sets can also be compared to identify sales to unassigned customers. This set result may include facts from the original order_facts table. If all customers are assigned to specific salespeople, then this set of orders represents those in which salesreps have taken orders from someone else s customer. This behavior is the source of great controversy in sales organizations with named customer assignments!

Table 2-1.

The application of set operations does not always have a useful result If it cannot be clearly defined using business terms, the set is not likely to support relevant analysis and, therefore, is not useful from a business perspective For example, it is possible to create a union of all salesperson/customer relationships for a period those that represent a customer assignment and those that result from orders being taken This set has no real semantic significance or use to the business In other applications, however, a UNION operation may be useful Precomputing the results of set operations is most often useful with intersect and minus operations and almost always involves a coverage table Other examples include identifying products that did or did not sell while under promotion, the effect of weather on sales, and the participation of eligible parties in a benefits program.

2:

Database servers are one of the fastest-growing segments of the computer systems market, driven by database installations on Unix and Windows NT-based servers Database management thus touches every segment of the computer market Since the late 1980s a specific type of DBMS, called a relational database management system (RDBMS), has become so popular that it is the standard database form Relational databases organize data in a simple, tabular form and provide many advantages over earlier types of databases SQL is specifically a relational database language used to work with relational databases..