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Before SQL Server replication will function properly, you ll need to ensure that you have network connectivity to each of your machines. This normally isn t a problem if you re connecting to your servers either on a private network or by using the Internet. However, it is a major concern if SQL Server must communicate with other machines through a firewall. In that case, you need to ensure that the appropriate networking ports are opened on the firewall and that all SQL Server installations are configured to use them. This can be set up using Client Network Utility and SQL Server Network Utility, available in the Microsoft SQL Server 7 program group. Figure 8-18 shows sample default settings in SQL Server Network Utility. By default, SQL Server 7 uses TCP Port 1433 to communicate with other servers using the TCP/IP protocol. This port assignment can be changed by using SQL Server Network Utility and Client Network Utility. If you are unable to communicate with other installations of SQL Server using standard network connections, you ll need to make changes in your network design. Keep this in mind when setting up replication in your environment.
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SQL Server 7 has been designed to perform two-way replication with various different data sources. These sources may include any type of data repository that is supported through the ODBC or OLEDB database access methods. For example, an Oracle server might function as a Subscriber to a SQL Server database. Bear in mind that with these types of data sources, you will not have access to all the features of SQL Server replication. Additionally, some custom development may be required to integrate other types of servers or data repositories. Fortunately, the SQL Server architecture has been designed to be flexible, and documentation and programming objects are available for various development languages.
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After you have set up replication, you ll need to ensure that it is working properly. There are several parameters that might affect its proper operation. Network connection availability and performance are two of the main considerations. We ve already mentioned several ways to ensure that SQL Server replication is working. In this section, we ll look at several ways to view information about replication and monitor related activities. This is a vital function for businesses that depend on replication services.
Configuring the Replication Monitor
SQL Server Enterprise Manager includes the Replication Monitor tool for quickly and easily viewing status and conflict information related to replication. This tool can give you periodic updates of the status of replication and is useful in ensuring that everything is working properly. Before relying on the information presented in Replication Monitor, you should make sure that you have made appropriate settings to the display. This can be done by right-clicking the Replication Monitor item in Enterprise Manager and selecting Refresh Rate and Settings. You ll see this dialog box:
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Here you ll be able to configure the update frequencies and other time intervals for Replication Monitor.
REMEMBER: Although a smaller replication status refresh time will give you more accurate information, it can also increase system resource usage. For example, if you have many Subscribers at remote locations, this can cause a lot of WAN traffic. The Performance Monitor tab in the Refresh Rate and Settings dialog box enables you to specify the path in which the default Performance Monitor chart information is stored.
Figure 8-19 shows the types of information you can see using Replication Monitor. By right-clicking various items, you can see even more details about replication conflicts and Agent settings.
Figure 8-19.
Viewing Replication Monitor information in Enterprise Manager
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Setting Replication Alerts
In many organizations, replication is a vital operation that must be carried out properly for business purposes. Therefore, if problems with replication occur, you ll want to ensure that you have set up the appropriate alerts. Figure 8-20 shows the default alerts that are included when you enable replication.
NOTE: These items are not enabled by default; you will likely want to configure notifications and operators for each of the items in the list. Additionally, you ll probably want to add more alerts, based on the importance of certain publications and how replication is configured. (For more information on configuring jobs, alerts, and operators, see 4, SQL Server 7 Architecture. )
Figure 8-20.
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