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This can produce unexpected and unintuitive behavior for compound foreign keys, such as the one that links the ORDERS table to the PRODUCTS table Suppose for a moment that the ORDERS table in the sample database permitted NULL values for the PRODUCT column, and that the PRODUCTS/ORDERS relationship had a SET NULL delete rule (This is not the actual structure of the sample database, for the reasons illustrated by this example) An order for a product with a manufacturer id (MFR) of ABC and a NULL product id (PRODUCT) can be successfully inserted into the ORDERS table because of the NULL value in the PRODUCT column DB2 and the ANSI/ISO standard assume that the row meets the referential integrity constraint for ORDERS and PRODUCTS, even though no product in the PRODUCTS table has a manufacturer id of ABC The SET NULL delete rule can produce a similar effect.

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A good dimensional design maximizes the potential value of your data warehouse If it is not easy to access the information, however, even the best dimensional schema becomes a black hole Luckily, there are a wide variety of software products available that can help make sure this does not happen Tools that are used to provide information to end users range in functionality from simple report writers to sophisticated business intelligence software products They can provide information in a numerous formats (charts, tables, dashboard widgets), over a variety of channels (computers, mobile devices, telephones), and according to varied access paradigms (on demand, scheduled, exception alerts) For the sake of simplicity, these tools will be referred to collectively as business intelligence tools The individual information products they provide to end users will be referred to as reports.

Data Protection in Windows NT/2000

Deleting a row from the PRODUCTS table will cause the foreign key value in all of its child rows in the ORDERS table to be set to NULL Actually, only those columns of the foreign key that accept NULL values are set to NULL If there were a single row in the PRODUCTS table for manufacturer DEF, deleting that row would cause its child rows in the ORDERS table to have their PRODUCT column set to NULL, but their MFR column would continue to have the value DEF As a result, the rows would have a MFR value that did not match any row in the PRODUCTS table To avoid creating this situation, you should be very careful with NULL values in compound foreign keys.

As the face of the data warehouse, these tools determine how information can, and cannot, be made available to the people who can use it Tool features are product-specific, and beyond the scope of this book However, most of these tools share one thing in common: they do not require the person developing a report to write a query When configured appropriately, business intelligence tools generate SQL queries for the report developer The SQL generation capabilities of these products can be a limiting factor for how dimensional data is accessed Another class of business intelligence tools supports OLAP applications These tools work with multidimensional cubes rather than relational stars Like their SQL-based cousins, most of these tools also do not require hand-coding of queries The capabilities of an OLAP solution stem directly from the depth and breadth of cubes that are made available in the analytic environment.

First of all, if more than one user can log on to the system as the Administrator, the possibility of accountability provided by auditing is made very difficult. For this reason, it is recommended that all users be given separate accounts.

An application that enters or updates data in the table that contains the foreign key should usually enforce an "all NULLs or no NULLs" rule on the columns of the foreign key Foreign keys that are partially NULL and partially non-NULL can easily create problems The SQL2 standard addresses this problem by giving the database administrator more control over the handling of NULL values in foreign keys for integrity constraints The integrity constraint in the CREATE TABLE statement provides two options: The MATCH FULL option requires that foreign keys in a child table fully match a primary key in the parent table With this option, no part of the foreign key can contain a NULL value, so the issue of NULL value handling in delete and update rules does not arise.

This chapter explores the impact of business intelligence tools on your dimensional designs You cannot control the query generation capabilities of business intelligence tools in your architecture, but understanding their workings gives you important insight into what kinds of reports can and cannot be produced Some shortcomings can be addressed with standard dimensional techniques, such as derived tables Other limitations may be.

The 32-bit Windows client OSs (Windows 9x and Windows NT) allow for the implementation of certain policies and profiles that, when used properly, give users enough freedom to do their jobs without allowing them to delete files to which they should not have access. Users who are network/systems administrators should be given two user accounts. The first should be their main user account under which they will log in for all normal tasks. A second Administrator account should be used only when necessary. For example, a network administrator named Jane Doe would have two user accounts: Jdoe and Jdoe-Admin.