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The architecture of SSIS is the most complex yet rewarding side of the technology to learn. Knowing the machinations that take place behind the scenes has enabled me on many occasions to perform genuinely revolutionary (to the client at least) optimizations that have dramatically improved package throughput in the most demanding of applications. As an SSIS specialist working with a deep and thorough understanding of the architectural framework, you can set yourself above your peers and provide real business value. For example, the ability not only to identify where bottlenecks occur, but also to predict and avoid them, will make you an SSIS hero. Don t just take my word for it. SQL Server comes with a veritable profusion of tools and features for examining the underlying architecture of SSIS. My personal favorite tool of all time (well, it s on a par with Lutz Roeder s Reflector) SQL Profiler is invaluable for identifying calls made to the SQL engine, while the comprehensive logging facilities within SSIS allow the monitoring of buffers, pipelines, and many other components. Performance counters are a great way to keep an eye on buffer activity at a lower level, and Lutz Roeder s Reflector tool is perfect for taking a peek inside SSIS s various components. The advances in ETL architecture that SSIS presents are substantial. Examining them has given you the opportunity to see why a straight comparison between a DTS package and an SSIS package is impossible. The architectures are fundamentally different, so performing ETL with SQL Server 2005 isn t just a case of loading up a legacy DTS package into SSIS and having it work as though nothing has changed. That said, SSIS does have provisions for upgrading and using DTS packages, which is the subject of 3.

Many of these settings appear cryptic, but you ll find they allow for the most granular configuration of the services. You can customize these items by using the same command and but pasting the particular setting on to the end of it, along with the desired value. For example, if you want to force all users who can authenticate into the iCal service to have an account in the directory services, you would use the following command:

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8. Now add three member variables. Listings 15-20 (C#) and 15-21 (VB.NET) show the code to use. Listing 15-20. Member-Variable Declarations (C#) private PipelineBuffer outputBuffer; private int[] inputColumnBufferIndexes; private int[] outputColumnBufferIndexes; Listing 15-21. Member-Variable Declarations (VB.NET) Private outputBuffer As PipelineBuffer Private inputColumnBufferIndexes() As Integer Private outputColumnBufferIndexes() As Integer The outputBuffer variable is used as a single reference to the output pipeline buffer for all methods in the class. The two integer array variables are used to store column buffer indexes for each column defined in the input and output buffers but I ll get to that in more detail shortly. 9. The code in Listing 15-22 (C#) or Listing 15-23 (VB.NET) should be added next. This is a simple helper method that, when called, raises a FireError event containing a message that describes any problem encountered. You will see it referred to repeatedly in subsequent code. Listing 15-22. Reusable Validation Helper Method (C#) private void PostError(string message) { bool cancel = false; this.ComponentMetaData.FireError(0, this.ComponentMetaData.Name, message, "", 0, out cancel); } Listing 15-23. Reusable Validation-Support Methods (VB.NET) Private Sub PostError(ByVal message As String) Dim cancel As Boolean = False Me.ComponentMetaData.FireError(0, Me.ComponentMetaData.Name, message, "", 0, cancel) End Sub 10. It s time to start implementing custom functionality, so you need to begin overriding methods to contain the custom code. First up is the Validate method. Enter the code shown in Listing 15-24 (C#) or Listing 15-25 (VB.NET).

the drop-down menu. If you are working in Visual Studio 2005, press F7 and use Shift+F7 to toggle between Code and Designer modes.

TIP: You can further reduce the maximum attachment size to the bytes level using the calendar:MaximumAttachmentSize setting. Each of the preceding settings can be altered using the serveradmin command with the settings option, followed by the string with the new content. For example, to change the path of the service log to the same folder on a different drive called LOGS, you would use the following command:

Listing 15-24. Overriden Validate Method (C#) public override DTSValidationStatus Validate() { DTSValidationStatus status = base.Validate(); if (status == DTSValidationStatus.VS_ISCORRUPT) { return status; } IDTSComponentMetaData90 metadata = this.ComponentMetaData; IDTSCustomPropertyCollection90 componentCustomProperties = metadata.CustomPropertyCollection; try { IDTSCustomProperty90 customProperty = componentCustomProperties["InputColumnToCheck"]; string s = (string)customProperty.Value; if (s.Length == 0) { PostError("InputColumnToCheck must be populated"); return DTSValidationStatus.VS_ISCORRUPT; } } catch (System.Runtime.InteropServices.COMException e) { if (e.ErrorCode == HResults.DTS_E_ELEMENTNOTFOUND) { PostError("Custom property 'InputColumnToCheck' not found in component custom property collection"); return DTSValidationStatus.VS_ISCORRUPT; } else { throw e; } } if (metadata.InputCollection.Count != 1) { PostError("Component requires exactly one input."); return DTSValidationStatus.VS_ISCORRUPT; } IDTSInput90 input = metadata.InputCollection[0]; IDTSInputColumnCollection90 inputColumns = input.InputColumnCollection; for (int j = 0; j < inputColumns.Count; j++) {

The Table data region provides a means of organizing data into tabular rows and columns with possible multiple grouping levels Every Table data region has, by default, a row that contains detail records as well as table headers and footers You can group tables on individual fields from a single dataset or with expressions that might combine multiple fields Tables make it easy to make a report uniform because of the structured nature of the table Fields from the dataset are simply added to a cell within the table, and when the report is rendered, it s automatically formatted This is in contrast to the List data region that provides much of the same functionality as tables but requires manually positioning and aligning fields.

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