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Because Mary's order-processing program was allowed to see the uncommitted update of Joe's program, the order from Mary's customer was refused, and the purchasing manager will order more Widgets, even though 139 of them are still in stock. The situation would have been even worse if Mary's customer had decided to settle for the 39 available Widgets. In this case, Mary's program would have updated the PRODUCTS table to show zero units available. But when the ROLLBACK of Joe's transaction occurred, the DBMS would have set the available inventory back to 139 Widgets, even though 39 of them are committed to Mary's customer. The problem in this example is that Mary's program has been allowed to see the uncommitted updates from Joe's program and has acted upon them, producing the erroneous results. The SQL2 standard refers to this as problem "P1," also known as the "dirty read" problem. In the parlance of the standard, the data that Mary's program has seen is "dirty" because it has not been committed by Joe's program.

The project team consists of dimensional designers, project sponsors, and, optionally, a project manager. The dimensional designers form the core of the team. Their efforts are best led by an experienced dimensional modeler, in partnership with one or more business or technical analysts with domain expertise. Keep this group small. Others will be given the opportunity to participate in major design decisions as part of a design review task. This core design team should have direct access to sponsors with decision-making authority in two major areas: within IT and within relevant business units. These people will be called upon to make resources available, review progress, and settle questions of scope. They will be instrumental in determining who the team will be interviewing, both on the business side and on the technical side. They will also be the primary participants in any prioritization activities. The addition of a project manager to the team can be very helpful. This individual can assume responsibility for monitoring progress and reporting it to sponsors. The project manager will handle scheduling interviews, rescheduling after cancellations, and organizing

The Option Pack may be installed on Windows NT and Windows 95/98 computers. The specific components available will vary based on the OS you re using. Figure 3-34 shows a list of some of the items that are available for installation on a Windows NT 4.0 Server installation. Details are available in the Option Pack documentation. In general, it is a good idea to install only the components you require. However, many of the components previously described have dependencies on each other. If you are unsure what to install, choose the Typical option it may take up a little more disk space, but it will prevent compatibility problems in the future. For details on components included with the Option Pack, see www.microsoft.com/ntserver.

design reviews and project prioritization sessions. A project manager can also take care of following up on requests for materials, sample reports, documentation, and other items.

Figure 12-8 shows the order-processing application once more. Again, Joe begins taking an order for 100 ACI-41004 Widgets from his customer. A short time later, Mary also begins talking to her customer about the same Widgets, and her program does a singlerow query to find out how many are available. This time Mary's customer inquires about the ACI-41005 Widgets as an alternative, and Mary's program does a single-row query on that row. Meanwhile, Joe's customer decides to order the Widgets, so his program updates that row of the database and does a COMMIT to finalize the order in the database. After considering the ACI-41005 Widgets as an alternative, Mary's customer decides to order the ACI-41004 Widgets that Mary originally proposed. Her program does a new single-row query to get the information for the ACI-41004 Widgets again. But instead of finding the 139 Widgets that were in stock just a moment ago, the new query

Figure 3-34.

Although the design team may be small, the design project will require the involvement of a number of additional resources Many of these people are very busy Project sponsors will be essential in securing their attention and involvement It will be necessary to provide these people with an understanding of the required level of involvement Their involvement must be scheduled in accordance with a project plan These participants can be grouped into several roles: Business users and analysts who will provide information about the business processes These people will be asked to prepare for, and participate in, at least one interview and be available for follow-up questions Source system developers will provide information about the source systems, available data, its quality, and operational profiles These people will be asked to provide information, participate in extended interviews, and work with the project team to map a dimensional design to source systems.

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