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For many users, the functions and responsibilities of IT are enigmatic. A typical workstation user is not interested in the routers and servers that must be working in order for them to do their jobs. That s one reason that IT-related problems can be so frustrating. By keeping users informed, you can avoid surprises and prevent many calls to the help desk. You will also give those who are affected by IT s actions time to make alternate plans. These simple practices can improve your users customer service experiences, and thus help improve their perception of your IT department. When problems occur, our reflex is to correct it. Often, we hope that nobody is adversely affected, and handle any issues through the help desk. While this is certainly one approach, it is much better to notify users of unplanned downtime after it occurs and to keep them informed of any issues related to incomplete backups. By doing this, you can avoid having to make excuses later.

While a pivoted fact table may simplify the construction of certain forms of reports, it is not without its drawbacks. As with any form of derived schema, it behooves the user to choose the appropriate data structure to use for any given report. To avoid potential confusion, pivoted schemas are sometimes made available only to trained developers. In many cases, the additional effort required to develop and maintain a pivoted schema is not justifiable. In the example in Figure 14-2, the benefits of the transposed schema may seem trivial. The original schema is highly summarized, and there is only a need to transpose two transaction types. The relatively small effort required to do so within a report may not justify the additional burden of loading and maintaining an additional star. The value of a pivoted schema increases as the number of rows to be transposed into columns increases. If, for example, there were several dozen transaction types to be transposed, the value proposition changes significantly.

Managing security and user permissions can often be a touchy subject for all who are involved. Employees may feel that they are not trusted if you limit their user access permissions. Explaining the real reasons for limiting permissions protecting accidental or malicious data loss can sometimes be the cure. However, there will still be political barriers. Creating new user accounts and changing passwords are permissions given to administrators by default, and they will undoubtedly create test accounts that may have weak passwords. Restricting permissions to only those who are needed to complete job functions can help prevent sloppy security implementations.

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A sliced fact table is exactly the same as the original star but only contains a subset of rows. Sliced fact tables are typically defined using a specific dimension attribute and may be useful in providing distributed applications, enforcing role-based security, or in reducing schema scope for use in an OLAP tool.

In many network environments, the knowledge of a simple password can circumvent any level of security. Perhaps one of the most important security measures an administrator can take is to educate users about potential security risks. Tell them never to share their passwords with other users, and inform them that IT staff will never ask them for this information, because an administrator can always change their password, if needed. A good way to enforce this policy is to recommend that they choose an embarrassing or very personal password. Finally, to keep users from sticking scraps of paper to the bottoms of their keyboards, notify them that they will be held responsible if another user uses their account without permission, unless adequate security measures are taken. Also, make sure that users have a good basic understanding of the Windows NT File System (NTFS) permissions file and directory permissions may change if these objects are moved or copied to different locations. (For technical details, see 3, Data Protection in Windows NT/2000. ) In many ways, maintaining a secure environment is more dependent on personnel and policy issues than on technology. Suppose an administrative assistant or other user

A sliced fact table is derived from a star by selecting all rows that refer to a common dimension value. The resulting star has the same attributes as the original but may be significantly smaller. Additional slices may be created for each possible value of the dimension attribute. For example, the familiar star at the top of Figure 14-3 tracks orders by day, product, salesperson, and region. One of the attributes of the salesperson dimension table is region. This dimension takes on values such as East, West, and so forth. Order_facts contains orders for all regions.