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The fundamentals of star schema design presented in this chapter are covered in every book that deals with dimensional design. Briefer treatment of the basics can be found in the author s previous work: Data Warehouse Design Solutions (Adamson and Venerable, Wiley, 1995), and Mastering Data Warehouse Aggregates (Adamson, Wiley, 2006). Both introduce the basics of fact tables and dimension tables in their opening chapters. The concepts of dimension tables, surrogate keys, fact tables, grain, sparsity, and slowly changing dimensions are universally accepted features of dimensional design. They were first codified by Ralph Kimball in magazine articles and later in the first edition of The Data Warehouse Toolkit. Now in its second edition, Ralph Kimball and Margy Ross s The Data Warehouse Toolkit, Second Edition (Wiley, 2002) covers the fundamentals of fact tables and dimension tables in 1. Slow changes are described in 4.

The properties of SQL Server Agent allow you to schedule tasks so that they occur when there is little or no activity on the database. Although it s often better to schedule jobs for times of the day or night when you know activity will be low, this isn t always possible. To set SQL Server Agent properties, do the following: 1. Expand the Management folder, right-click SQL Server Agent and select Properties. You ll see this dialog box:

Show me the result if I raised each salesperson's quota by 3 percent of their year-to-date sales. SELECT NAME, QUOTA, (QUOTA + (.03*SALES)) FROM SALESREPS NAME --------------Bill Adams Mary Jones Sue Smith Sam Clark Bob Smith Dan Roberts Tom Snyder Larry Fitch Paul Cruz Nancy Angelli QUOTA ----------$350,000.00 $300,000.00 $350,000.00 $275,000.00 $200,000.00 $300,000.00 NULL $350,000.00 $275,000.00 $300,000.00 (QUOTA+(.03*SALES)) ------------------$361,037.33 $311,781.75 $364,221.50 $283,997.36 $204,277.82 $309,170.19 NULL $360,855.95 $283,603.25 $305,581.26

The simplest way to deal with a multi-valued dimension is to decompose the many-to-many relationship into two or more one-to-many relationships. This solution makes use of roles, as covered in 6. The fact table will have not one relationship to the dimension table but two or more. For a given fact, each of the relationships will identify exactly one row in the dimension table. In the case of collaboration among salespeople, order_facts can be designed with two salesrep_keys. One is designated as primary, the other as secondary. The resulting design is depicted in Figure 9-3. The figure depicts two aliases for the single salesrep table. Each is connected using the appropriate foreign key in the fact table. If only one salesperson is involved in a particular order, the secondary_salesrep_key will refer to a special row in the salesrep table for not applicable, a technique also described in 6. This design appears to solve the problem, but issues are lurking beneath the surface. First, there are certain forms of reporting that will now be much more complicated. Want to total up order_dollars for a particular salesperson You ll have to filter your query twice, once for the primary salesperson and once for secondary, and link these filters with or. Want to list all salespeople along with the total order_dollars in which they were involved You ll probably need to query the fact table twice, once grouping order_dollars by the primary salesperson, and again grouping order_dollars by the secondary salesperson. Then, you can merge the result sets together. All this becomes more complicated if the fact table allows for three salespeople, or four, or more.

2. On the General tab, you can specify the account to be used by SQL Server Agent, the mail profile to be used for sending messages, and the name of the file to save error information to. Optionally, if you want a user to see a pop-up dialog box when errors occur, enter the name of the user who should be alerted. 3. On the Advanced tab, you can set the Idle CPU conditions, as desired. The Percentage Threshold specifies the maximum CPU usage, and the number of seconds specifies the minimum duration of this level of activity before tasks are run. You can also configure whether you want SQL Server Agent to restart when an unexpected stop occurs. Finally, you can choose to forward events to remote servers so that all information can be managed in a single location. 4. The Alert System tab allows you to send e-mail to a compatible pager. A failsafe operator can also be set up as an alternative recipient when an error occurs. 5. The Job System tab allows you to configure settings for the maximum log size. Here, you can also restrict access to executing operating system commands to system administrators. This option prevents users from running jobs under elevated privileges using the CmdExec procedure.

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