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NET, all use TDS behind the scenes to establish a link between the client application and a specific instance of SQL Server, so they all share a common purpose to expose TDS to one programming interface or another that can be easier to use Connections can be established over a network (WAN or LAN), or established directly by using a shared memory data access provider if the client and SQL Server service are running on the same system As you add logical or physical layers between the client and SQL Server, more issues are exposed issues that make connecting more and more difficult This means you should try to use the Shared Memory provider whenever possible.

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No, this does not mean you should avoid multi-tiered systems or service-oriented architectures which centralize access to the SQL Server instance, but it does mean that when building an object layer or service that s hosted on a system that s also hosting the SQL Server instance, it makes abundant sense to bypass the network layer and use the shared memory provider A SQL Server 2008 instance can support up to 32,767 connections, which is an order of magnitude more than you ll ever need In reality, the upper limit of connections is limited by available resources like RAM, available CPU cycles, the version of SQL Server installed, and how the DBA has configured the system.

As mentioned earlier in this chapter, the open command in AppleScript s Standard Suite doesn t return a result, so you can t assign the workbook you re opening to a variable If you need to assign the workbook you re opening to a variable, use Excel s open workbook command, which returns a result that you can assign to a variable This command takes the parameter workbook file name followed by the filename For example, the following statement opens the workbook named Amortizationxlsx in the Server:Shared:Sheets folder and assigns it to the variable amort:

Even SQL Server Express edition can support hundreds (or even thousands) of connections, but because of further version-specific constraints applied to RAM and processor utilization, it s not likely that you ll be able to maintain more than a few hundred viable connections Contrary to popular myth, connections are not expensive Unlike other DBMS systems that create full-duplex heavyweight connections or perform burdensome DDL queries when connecting, a SQL Server connection has a fairly small impact on the server (and client) SQL Server s connections are half-duplex This means that a connection can handle only one operation at a time a connection is either in talk mode or listen mode..

set amort to open workbook workbook file name "Transfer:Examples:Excel:Amortizationxlsx"

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Think of a connection like a CB radio conversation in which only one person can talk at a time. This is why radio operators use established protocols to end a packet of conversation by saying Over when they ve finished talking. 10 4

The XML task is provided in SSIS so that you can work with XML in the control flow. Because the Data Profiling task produces XML, it is a natural fit to use the XML task to process the data profile output. Primarily, the XSLT or XPATH operations can be used with the profile XML. The XSLT operation can be used to transform the output into a format that s easier to use, such as filtering the profile output down to specific profiles that you are interested in, which is useful if you want to use the XML source to process it. The XSLT operation can also be used to remove the default namespace from the XML document, which makes using XPATH against it much easier. XPATH operations can be used to retrieve a specific value or set of nodes from the profile. This option is illustrated by the Trim Namespaces XML task in the sample package that accompanies this chapter, showing how to retrieve the null count for a particular column using XPATH.

To close a workbook, use the close command with the workbook keyword and the workbook s name or a variable or object identifying the workbook For example, the following statement closes the workbook named Product Goal-Seekingxlsb:

Summary

The sample package for this chapter can be found on the book s website at http://www.manning.com/SQLServerMVPDeepDives.

close workbook "Product Goal-Seekingxlsb"

If you are new to XML, the preceding discussion may be a bit confusing, and the reasons for taking these steps may not be obvious. If you d like to learn more about working with XML in SSIS, please review these online resources: General XML information: http://msdn.microsoft.com/en-us/xml/default.aspx Working with XML in SSIS: http://blogs.msdn.com/mattm/archive/tags/XML/ default.aspx