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HISTORIC_COVERAGE pol_coverage_key family_size covered_parties spouse_coverage covered_children deductible_amount . . . Alias for: Coverage Role: Coverage at transaction time

CAUTION: It is possible (and potentially embarrassing!) to lock yourself out of the system by setting policies that are too restrictive. Be careful when you make changes, especially to the Administrator account, and be sure to always leave a user account available as a safety net to make changes. If such an account is not available, you will need to circumvent the policies by either deleting or disabling them through the use of another user account.

and REVOKE, discussed in 15). These statements must be executed outside a transaction. This restriction makes the transaction model easier to implement, because it ensures that the structure of the database cannot change during a transaction. In contrast, the structure of a database can be altered significantly during an ANSI/ISO-style transaction (tables can be dropped, created, and populated, for example), and the DBMS must be able to undo all the alterations if the user later decides to roll back the transaction. In practice, the Sybase prohibitions do not affect the usefulness of the DBMS. Because these prohibitions probably contribute to faster transaction performance, most users gladly make this trade-off.

Figure 16-8

To set up system policies: 1. Start System Policy Editor from the Administrative Tools program group. 2. Select File | New Policy to create a new policy file. The basic default policy template files are already loaded. 3. Select Default Computer | Run and place a checkmark next to the Run command. The values in this section are selected (checkmark), not Selected (unchecked), or unspecified (a grayed-out box):

where it represents the status at the time of each transaction recorded in the fact table. When added to the query, it will be joined to the fact table, not back to the policy table. TIP When there is a shortcut relationship between a mini-dimension and the main dimension, it is important that it not be brought into queries involving the fact table. To avoid this problem, create separate aliases for the mini-dimension. One will be joined to the main dimension; the other will be joined to the fact table. To make the two versions of each attribute in the mini-dimension easily distinguishable, the views (or semantic layer) should name them appropriately. For example, the version of family_size that appears in the view that joins to the policy table can be named current_ family_size; the other can be named historic_family_size. Notice that it is only possible to cross-browse the policy table with current coverage attributes. This is a consequence of the mini-dimension, not the business intelligence tool. As discussed in 6, mini-dimensions disrupt the ability to study historic correlations between the main dimension and the mini-dimension, unless a factless fact table is added to the schema to track the history.

4. For the program name, type WordPad.exe. The illustration provides examples of other options. 5. Select Windows NT Shell | Custom Shared Folders and place a checkmark next to Custom Shared Desktop Icons. This will allow you to specify a path to use for shared icons. In this example, I m using the path c:\desktop. 6. Select Windows NT System | Logon | Logon Banner and enable the selection.

Transactions: Behind the Scenes *

A similar pattern occurs when a very wide dimension is split into two tables arbitrarily. Also discussed in 6, this technique differs from the mini-dimension in that both halves of the split dimension share the same surrogate key. There is a true one-to-one correspondence between rows of the tables. In this case, we would like to join the two tables together when browsing, but join each to the fact table when querying facts. The join between the two halves of the split dimension will not compromise the results, but it may disrupt performance. The best alternative here is to configure the lesser-used half of the split dimension as an outrigger. This is also not ideal, since it has the potential to disrupt a star-join optimizer. The database administrator may be the best person to make the call in this situation.

3: