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The package I used is shown in Figure 12-21. It s a very simple Data Flow but, by comparing the captured trace to the information captured within SSIS, you can get a better understanding of what s going on under the hood.

NET assemblies can perform to check or modify the permissions that assemblies further up or down the call stack will receive: Demand: An assembly demands a particular permission to ensure that all calling assemblies have the right to perform a particular action When a Demand is made, NET will check all methods further up the call stack to make sure that they too have permission to perform this operation If they don t, an exception will be thrown For example, suppose you build a library with methods to read and update files from the Windows file system This would be called from other assemblies, some of which may be written by other people and potentially malicious By demanding the File IO permission in our code, you ensure that your method can only be called by assemblies that themselves have the right to access the file system The .

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'First, get the state description strSQL = "SELECT mirroring_state_desc from sys.databases WHERE " & _ " name = '" & strDatabaseName & "'" strReturnValue = ExecuteScalar(strConnectionStringPrincipal, strSQL) If strReturnValue = "" Then strReturnValue = "Unconfigured" End If lblDBMirrorStatusText.Text = strReturnValue

Figure 12-21. My simple package So let s take a look at the Data Flow. I ve got two transformation components in there that, as 2 will remind you, are nonblocking, streaming, and synchronous (in the case of the Derived Column) and blocking and asynchronous (in the case of the Sort). In terms of buffer usage, the Data Flow presents the information in Figure 12-22. I ve dipped back into the SSIS development environment here to take a look at some of the logging that can be captured in this case around the pipeline execution tree. I won t go into too much detail here, but the information presented by the execution tree and the other information that can be logged when a package executes proves useful in identifying potential optimizations. I discuss these topics a little later in this chapter. Getting back to the SQL side of package execution: as often happens, inefficient queries can form the basis of poor performance. The inefficiency could be a result of poor or corrupt indexing, disk issues, or any number of other causes that one would associate with typical SQL Server performance problems. Using SQL Profiler should, however, reinforce the discovery of the source of the problem and, in turn, this suggests that query optimization should take place or that there is a larger problem at hand.

'Get the Principal's role strSQL = "SELECT mirroring_role_desc from sys.databases WHERE " & _ "name = '" & strDatabaseName & "'" strReturnValue = ExecuteScalar(strConnectionStringPrincipal, strSQL) If strReturnValue = "" Then strReturnValue = "Unconfigured" End If lblPrincipalText.Text = strReturnValue

NET Framework Class Libraries make very frequent use of this, so as you d expect the file I/O classes in the SystemIO namespace form any file access..

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