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consider using the standard backup and recovery mechanisms included in SQL Server 7. Some of these features might result in a less costly and easier-toadminister solution than replication. v Take stock of available staff. In order to successfully implement and manage a replication solution, you ll need to allocate individuals with the appropriate skills. Although setting up basic replication settings in SQL Server is quite easy, a good knowledge of network architecture and the replication process will be crucial later on for troubleshooting problems. Be sure you ll have the staff you need well before your databases become unsynchronized due to a configuration problem.

The ANY test is used in conjunction with one of the six SQL comparison operators (=, <>, <, <=, >, >=) to compare a single test value to a column of data values produced by a subquery. To perform the test, SQL uses the specified comparison operator to compare the test value to each data value in the column, one at a time. If any of the individual comparisons yield a TRUE result, the ANY test returns a TRUE result.

When a dimension table has an associated hierarchy bridge, a type 2 response to changed source data will require several measures: The creation of a new row in the dimension table for the changed member The creation of new rows in the dimension table for all members that participate in a hierarchy with the changed member The creation of new rows in the bridge table to associate all these new dimension rows This sounds complicated, but it is not. Although tedious, these steps can be executed in a routine fashion. In order to illustrate this process, it will be necessary to drop the convention of using names like Company 1 that correspond to key values. A type 2 change generates multiple

Once you ve thought through these issues, you ll probably have a good idea of whether or not SQL Server s replication features are practical for your environment. Assuming that they are, let s move on to look at how replication actually works in SQL Server 7.

versions of a company, each with its own surrogate key. For this example, consider a set of companies identified as Company A through Company H. They participate in a hierarchy that is pictured in Figure 10-13. One of the companies in this hierarchy, Company E, is about to undergo a type 2 change. The company dimension table includes a natural key called company_id, which uniquely identifies a company in the source data, as well as a surrogate key. Assume that the dimension table contains rows for Companies A through H. An associated order_facts table is tracking orders, and a hierarchy bridge has been implemented to allow facts to be studied by looking down or up from any point in the hierarchy. In the source system, Company E undergoes a change. The company has moved, and its headquarters location has been updated. This change calls for a type 2 response. The response unfolds as follows: 1. In the dimension table, Company E receives a new row with a new surrogate key. The old version of Company E is left in place and remains associated with previously recorded facts. The new version of Company E, which we will call E-1, will be associated with any new facts.

To bring some order to the terms and operations required for implementing replication, Microsoft has used a Publisher-Subscriber metaphor. This makes the terminology used for managing replication in the SQL Server 7 world easy to understand. Several major areas must be defined before you can implement your replication. First, you must determine what to replicate. In SQL Server terminology, a publication is a grouping of data that is to be replicated. It is a collection of one or more articles. An article specifies the exact information to be replicated. An article may be a complete database table or only part of one. The following are the different types of articles: w s Full table A full table that is used for replication. All rows and columns of the table are made available. Horizontal partition A set of rows that is made available for publication. For example, a database administrator might replicate data for the current year only, although the table itself contains much more information. Vertical partition A subset of the columns of a table that is made available for publication. For example, a database administrator might define that only 3 columns out of a 15-column table are to be made available for replication. Stored procedure A stored procedure is simply a SQL query that is encapsulated as a database object. For more granular control of the information contained in an article, a database administrator can use the results of a stored procedure for publishing information. This method enables the administrator to select only certain rows and columns, as well as format and transform the data.

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