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Declarative data integrity is implemented using either constraints or rules. Rules are objects that are similar in function to check constraints. However, you should not use rules in your database because rules are a deprecated feature in SQL Server and will most likely be removed in a future release of the product. This leaves you with constraints. There are five types of constraints: PRIMARY KEY, UNIQUE, FOREIGN KEY, CHECK, and DEFAULT. Default constraints are only used to provide default values for columns and, therefore, they are not covered in this chapter.

Package debugging lets you know via the SSIS Designer what is going on during the execution of a package so that you can troubleshoot or validate processing logic. Control flow debugging involves setting breakpoints in the package, which will pause the control flow execution so that you can observe the execution state. SSIS takes advantage of the breakpoint functionality that comes with Visual Studio, which means that you have the capabilities to view execution information about the package when you execute a package in the SSIS Designer.

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Breakpoints function in the control ow but not in the data ow. for scripting, this means that you can set breakpoints only in a control ow Script Task but not in a data ow Script Component Transformation.

Both primary keys and unique constraints identify a column or combination of columns that uniquely identifies a row in a table. This is enforced through the creation of a unique index; for example, an index that does not allow duplicate values. Because of this, a primary key and

Summary

By default, networked computers are grouped in a single workgroup named WORKGROUP. The underlying protocol for the network is the TCP/IP suite. Com puter names are NetBIOS names, and names are resolved only by using NetBT broadcasts to the local network segment. Security is configured locally at each computer; no centralized security exists. When no DHCP server is present, the computers assign themselves APIPA addresses in the range of 169.254.0.1 169.254.255.254. This default addressing fea ture provides basic connectivity but does not allow for shared Internet connec tions, subnetting, or any centralized administration of addresses. You can greatly extend the default infrastructure of a Windows Server 2003 network by installing and configuring additional network components or adding server roles. You can add centralized addressing (DHCP) and name resolution (WINS, DNS) services for your network. If you have Administrator privileges on a local computer, you can install new cli ents, services, and protocols to be used by particular network connections. You can configure various services, such as the Routing And Remote Access ser vice or Certificate Services, to run on the server computer and provide a service for other network hosts.

To set a breakpoint, select the task or container, and either press F9 or navigate to the Debug/Toggle Breakpoint menu. You can set multiple breakpoints in a package, and you can embed a breakpoint within a Script Task at a line of code. Figure 2-17 shows a package that is running but is paused at execution.

A. The zone file on DC7 contains the host resource records for all the clients in the fourthcoffee.com domain. B. DC5 is authoritative for the denver.fourthcoffee.com DNS zone. C. If you open the DNS console and access DC7 server properties, the SOE tab will be present but the parameters are unavailable. D. DC1 is the only domain controller on which you can access the Security tab in the DNS server properties dialog box.

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