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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.
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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.
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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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All of these methods enable you to specify exactly which information is replicated. In general, it is a good idea to replicate only the needed information, because that will increase performance and decrease network bandwidth requirements. Figure 8-2 illustrates the differences between these types of articles.
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Figure 8-2.
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Various articles used in replication
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When dealing with replication, you ll need to define logical roles for each of the servers involved. The roles supported in SQL Server 7 include the following: w Publisher The source of the information that is replicated. It contains a master copy of the articles that are to be made available to other servers. Each item has only one Publisher, regardless of whether or not Subscribers are also able to update the information. Distributor Responsible for maintaining a record of the changes that are to be sent from the Publisher to one or more Subscribers. Servers that operate as Distributors hold a copy of a special database named distribution. The exact method in which this database operates varies based on the type of replication being performed. Subscriber The logical destination for information made available by Publishers. In some replication configurations, Subscribers can make updates to data and send them back to Publishers.
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