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Using SQL, the structure of a database can be changed and expanded dynamically, even while users are accessing database contents. This is a major advance over static data definition languages, which prevented access to the database while its structure was being changed. SQL thus provides maximum flexibility, allowing a database to adapt to changing requirements while on-line applications continue uninterrupted.

Merge Agent Responsible for determining and recording incremental data changes that occur on databases participating in replication. It does this by comparing the data in the initial snapshot that was created with the information in the database at the time the process runs. Depending on the specifics of the replication configuration, the Merge Agent may run on the Publisher or the Subscriber. The Merge Agent may, for example, run on the Subscriber if two-way replication is enabled.

A time-stamped dimension is one that tracks the history of changes in the dimension table itself, rather than through a separate fact table. The solution captures the same information as a tracking star like the one in Figure 8-2. The dimension is outfitted with additional columns to capture the effective and expiration dates for the row. Optionally, an additional column may track the transaction type or reason for the change. A flag is added, which can be used easily to select the current row in the table for any given natural key.

These processes are executed as required by the replication configuration. The SQL Server Agent runs all the processes and is responsible for ensuring that they are performed as required. If, for some reason, SQL Server replication is not working properly, you should check the status of these Agents to pinpoint the problem. Now that we have a good understanding and overview of how SQL Server 7 replication works, let s move on to examine methods for actually implementing replication.

By processing a type 2 change for every member of the hierarchy, we avoid the problem encountered earlier. A user looking up from Company H will still use its natural key to constrain the query, and this will still pick up H and H-1. However, no new transactions will be added above H, since those companies have undergone type 2 changes as well. The only facts that will be counted are those that were in place above H before the change, or above H-1 after the change (none). Any new transactions with Companies F, E, or A will be associated with F-1, E-1, or A-1. These rows have no association with any version of Company H, so they will not be counted. TIP When the relationships between members of a hierarchy change, process a type 2 change for each member and add the new relationships to the bridge table. Other solutions may lead to erroneous query results. Time-stamped rows in the bridge table are an alternative, but will require that each query be carefully qualified in correlation with the granular facts. Even trained developers are likely to err when writing SQL to do this. In addition, business intelligence tools may not be able to generate the required SQL, and query performance may be degraded. Rippling the change is a far safer solution.

SQL is a natural vehicle for implementing applications using a distributed, client/server architecture. In this role, SQL serves as the link between "front-end" computer systems optimized for user interaction and "back-end" systems specialized for database management, allowing each system to do what it does best. SQL also allows personal computers to function as front-ends to network servers or to larger minicomputer and mainframe databases, providing access to corporate data from personal computer applications.

Further design options are possible for the hierarchy bridge. Embellishments to the basic design discussed in this chapter include the addition of effective and expiration dates and additional flags to signal the top or bottom of a hierarchy. It is also possible to construct a bridge that does not require each member to have only one parent, or to construct multiple bridges if there are multiple alternative hierarchies.