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In the sample database, the SALESREPS table contains the REP_OFFICE column, a foreign key for the OFFICES table. The OFFICES table contains the MGR column, a foreign key for the SALESREPS table. As shown in Figure 11-5, these two relationships form a referential cycle. Any given row of the SALESREPS table refers to a row of the OFFICES table, which refers to a row of the SALESREPS table, and so on. This cycle includes only two tables, but it's also possible to construct cycles of three or more tables.

Date 01/17/2000 02/17/2000 06/05/2000

A column called level is used to indicate what each row represents It takes on the values Month or Day Not all the attributes of the table apply to months; those that do not default to a preselected value such as N/A for textual data The shaded row shows what this looks like for the row that represents January 2009 Some designers prefer to use NULL values for nonapplicable columns, although these can lead to problems at query time, as you learned in 6 This multipurpose dimension table makes it possible to store monthly summaries in the same fact table that records daily data The fact table includes a day_key For rows that contain daily data, this key will refer to a dimension row that represents a day For rows that contain monthly data, it will refer to a dimension row that represents a month.

Regardless of the number of tables that they involve, referential cycles pose special problems for referential integrity constraints. For example, suppose that NULL values were not allowed in the primary or foreign keys of the two tables in Figure 11-5. (This is not, in fact, the way the sample database is actually defined, for reasons that will become obvious in a moment.) Consider this database update request and the INSERT statements that attempt to implement it: You have just hired a new salesperson, Ben Adams (employee number 115), who is the manager of a new sales office in Detroit (office number 14).

Action Performed Backup: 7GB Recovery for Jane Doe (per Joe Manager): Medium Priority Restoration of Server1 Home Directories (hardware failure)

In this scenario, a query can make use of the monthly aggregates by adding a constraint like this one:.

08/01/2000

WHERE day.level = "month"

- 223 -

A query that focuses on the daily detail includes a constraint like this one:

The goal of this chapter was to provide the knowledge base you ll need to put together a successful data protection plan. You should definitely consider the ideas presented here as you decide what features to include in the plan you devise for your own organization. We started by looking at various backup scenarios and methodologies; chances are good that you re already using some of these ideas in one way or another. We then briefly surveyed the hardware and software available for performing backup and recovery operations. Next, we presented some practical considerations crucial to a sound data protection policy, and some management tools that can help you ensure your policy s success. With all the business requirements and fundamental decisions now out of the way, we can focus on the more technical aspects of data protection. In the next chapter, we ll discuss how you can secure your Windows NT and Windows 2000 operating systems.

INSERT INTO SALESREPS (EMPL_NUM, NAME, REP_OFFICE, HIRE_DATE, SALES) VALUES (115,'Ben Adams', 14, '01-APR-90', 000) INSERT INTO OFFICES (OFFICE, CITY, REGION, MGR, TARGET, SALES) VALUES (14,'Detroit', 'Eastern', 115, 000, 000) Unfortunately, the first INSERT statement (for Ben Adams) will fail Why Because the new row refers to office number 14, which is not yet in the database! Of course, reversing the order of the INSERT statements doesn't help: INSERT INTO OFFICES (OFFICE, CITY, REGION, MGR, TARGET, SALES) VALUES (14,'Detroit', 'Eastern', 115, 000, 000) INSERT INTO SALESREPS (EMPL_NUM, NAME, REP_OFFICE, HIRE_DATE, SALES) VALUES (115,'Ben Adams', 14, '01-APR-90', 0.

WHERE day.level = "Day"

Data Protection in Windows NT/2000

day_ key 700 755 762 766 775 level Month Day Day Day Day month_ hoilday_ name flag 12/31/9999 January N/A full_date 1/1/2009 1/8/2009 January January Y N N N year 2009 2009 2009 2009 2009