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An aggregate navigation function automatically formulates SQL to access aggregates. Tools offer this capability in a variety of ways. The best make it possible to leverage a new aggregate without having to rewrite a query or recompile a report. Some also offer the capability to take aggregates online and offline, in real time. Aggregates may be constructed using features of database products or specialized tools. To achieve the maximum benefit, these tools usually need to know a lot about the base schema. In return, they are able to generate performance structures automatically, and may also provide aggregate navigation services.

NOTE: This chapter focuses on technical ways to protect information on Windows NT and Windows 2000 OS platforms. We won t cover Windows 95/98 security in depth, because these platforms have not been designed for security. As we ll see later in this chapter, the lack of a secure file system makes it difficult to protect information on Windows 95/98.

Aggregates can be implemented without adding any special tools to the data warehouse architecture. However, many software products have features that make them easier to create and use:

Unlike primary keys, foreign keys in a relational database are allowed to contain NULL values. In the sample database the foreign key REP_OFFICE, in the SALESREPS table, permits NULL values. In fact, this column does contain a NULL value in Tom Snyder's

Experienced network security analysts know that it s wise to know how individuals may intrude networks or perform unauthorized actions. When designing security policies, you should always think about which gaps are being left open. Also, it s tempting to implement security through obscurity. For example, one might set up a server with an IP address that is unlisted in DNS and other name resolution services. The administrator may think that this server is fairly secure, because few people will know that the machine is there. However, there are several tools and tactics that hackers can use to find it: w Network analyzers Also called sniffers, these devices can monitor and intercept raw data packets that are traveling on your network. This includes password information (hopefully encrypted) and all data transfers. Password-breaking tools Tools that test files against a dictionary of common passwords can be used to attempt to break into accounts. As a systems administrator, it s a good idea to routinely use these tools on your own accounts database to identify user accounts with weak passwords. Impersonation Perhaps the best way to get a user s password is to call him or her and say that you re calling from the IT department and need their password to make changes to their e-mail account. Exploiting known bugs Many hacks are performed after information on bugs or security flaws are discovered and publicized. Usually, there are patches or configuration workarounds that can reduce the risk of these attacks. It s important for systems administrators to find out about the latest security breaches as soon as possible. Later in this chapter, we ll look at some good resources for keeping on top of security issues.

Other ways to summarize data that do not meet this chapter s definition of an aggregate include the following: Derived tables, as described in the previous chapter, may provide a useful alternative. A single-table design, on the other hand, is likely to lead to trouble.

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An often-overlooked area of security concerns protecting your critical business systems physically. There is very little that can be done if someone simply walks away with one of your servers or even a laptop that has sensitive business information stored on it. Of course, most businesses have security guards and locked rooms in place to protect against these actions. It is worth noting, however, that just as with any other security technique, you should maintain the maximum amount of security available without hindering usability. Usually, systems and network administrators will have access to server rooms and wiring closets. If possible, access to these areas should be logged, and pass codes should be changed frequently. IT staff should also understand that it is their responsibility to make sure that these areas remain secure and that pass codes or other secret information is not given out. With adequate physical security in place, you can move on to protecting your data from those that try to get to it from your network.