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The data stores associated with these systems may take a number of different forms, including hierarchical data, relational data, and even simple spreadsheets For the sake of simplicity, only four operational systems are depicted In the real world, any organization s portfolio of operational systems is sure to be significantly larger These systems feed a process labeled ETL for extract, transform, load This process consolidates information from the various operational systems, integrates it, and loads it into a single repository called the enterprise data warehouse This processing step is nontrivial It may require accessing information in a variety of different formats, resolving differing representations of similar things, and significant restructuring of data Some organizations refer to this process as data integration It may be a batch process that runs periodically or a transaction-based process that occurs in near real time The final result is the same: the enterprise data warehouse.

Disk Mirroring provides fault tolerance and a slight performance increase, but reduces usable storage space by 50 percent. s RAID 5: Disk Striping with Parity drive: Uses one disk in an array as a parity

Another SQL2 data integrity feature, the check constraint (described in 11) is also specified in the CREATE TABLE statement. A check constraint specifies a "check condition" (identical in form to a search condition in a SQL query) that is checked every

The enterprise data warehouse is the hub of the corporate information factory It is an integrated repository of atomic data Integrated from the various operational systems, it contains a definitive and consistent representation of business activities in a single place Atomic in nature, the data in this repository is captured at the lowest level of detail possible..

Disk Striping with Parity can survive a failure in any disk without data loss or interruption of service (although performance will decrease). Table 3-3 compares the general effects on performance and disk space when these RAID levels are implemented. One limitation is that Windows NT Boot and System Partitions can only use RAID Level 1 (Disk Mirroring) for protection. Implementing RAID Level 5 (Disk Striping with Parity) does come at a price: Server processing and memory will be used for calculating, reading, and writing the additional information required. However, having multiple physical disks working at the same time will decrease data access times, and performance degradation with modern processors will be negligible. In 5, we ll examine the benefits of choosing a hardware-based RAID solution. It is important to note that implementing RAID is not a substitute for maintaining regular backups. Although RAID-based fault tolerance will protect against physical disk failures, it will not protect against the accidental deletion of files or a natural disaster. As we saw in previous chapters, loss of data due to user error and other unwanted changes are often more likely than hardware failures. Nevertheless, on the server side, systems administrators find investing in RAID solutions to be an excellent data protection solution.

ORDER_FACTS day_key product_key salesrep_key company_key . . . order_dollars . . . COMPANY company_key company_id company_name company_type . . .

- 264 -

Loss of Disk Space 0% 50% Up to 33% (equal to the size of one of the drives in the array)

Novice Configuration Study only the company that placed the order Avoids double-counting COMPANY COMPANY_HIERARCHY_ BRIDGE superior_company_key subordinate_company_key company_key company_id company_name company_type . . .

Table 3-3.

time an attempt is made to modify the contents of the table (with an INSERT, UPDATE, or DELETE statement). If the check condition remains TRUE after the modification, it is allowed; otherwise, the DBMS disallows the attempt to modify the data and returns an error. The following is a CREATE TABLE statement for the OFFICES table, with a very simple check condition to make sure the TARGET for the office is greater than $0.00. Define the OFFICES table with a uniqueness constraint. CREATE TABLE OFFICES (OFFICE INTEGER NOT NULL, CITY VARCHAR(15) NOT NULL, REGION VARCHAR(10) NOT NULL, MGR INTEGER, TARGET MONEY, SALES MONEY NOT NULL, PRIMARY KEY (OFFICE), CONSTRAINT HASMGR FOREIGN KEY (MGR) REFERENCES SALESREPS ON DELETE SET NULL, CHECK (TARGET >= 0.00)) You can optionally specify a name for the check constraint, which will be used by the DBMS when it reports an error if the constraint is violated. Here is a slightly more complex check constraint for the SALESREPS table to enforce the rule "salespeople whose hire date is later than January 1, 1988 shall not be assigned quotas higher than $300,000." The CREATE TABLE statement names this constraint QUOTA_CAP: CREATE TABLE SALESREPS (EMPL_NUM INTEGER NOT NULL, NAME VARCHAR (15) NOT NULL, . . . CONSTRAINT WORKSIN FOREIGN KEY (REP_OFFICE) REFERENCES OFFICES ON DELETE SET NULL CONSTRAINT QUOTA_CAP CHECK ((HIRE_DATE < "01-JAN-88") OR (QUOTA <= 300000))) This check constraint capability is supported by many of the major DBMS brands.

Expert Configuration 1: Looking Down from a Company Groups transactions that occur at or below each company Double-counting is possible COMPANY COMPANY_HIERARCHY_ BRIDGE superior_company_key subordinate_company_key company_key company_id company_name company_type . . .

3:

Figure 16-11

Physical Storage Definition *

Data Protection in Windows NT/2000