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Although the chapter was only intended to be an introduction to how the optimizer assesses the cost of using a simple B-tree index, we have covered a lot of ground. Key points to remember though are as follows: The typical cost of using a B-tree index comprises three components the depth of the index, based on the blevel; the number of index leaf blocks that will be visited, based on leaf_blocks; and the number of visits to table blocks, based on the clustering_factor. The clustering_factor of an index is a primary indicator of how desirable the index appears to be to the optimizer. The drawback is that you need to compare the clustering_factor to the number of rows and blocks in the table the number by itself is effectively meaningless. If you have columns in an index that are often omitted from the where clause or have range-based tests applied to them, then they should generally be pushed towards to the end of the index definition; otherwise your query could end up doing a lot of work with index leaf blocks. The optimizer s cost calculation will reflect this, and may result in the index being ignored in favor of alternative paths. System statistics should be enabled as part of your migration to 9i (or 10g), and you need to be aware of the impact this will have on execution plans.

One way to use the System.Diagnostic methods for debugging/tracing in orchestrations is to wrap the logging code in an If statement and create a TraceFlag that can be set in a configuration file, such as the BTSNTSvc.exe.config file in the root BizTalk Program Files folder. Here is an entry you could add to the BTNTSvc.exe.config file: <add key=" TraceFlag" value="true"/> Listing 10 1 demonstrates how to retrieve the TraceFlag and, based on its value, log information. Listing 10 1. Configurable Trace Flag // set the trace flag based on a value stored in the BizTalk Config File // note that blnTraceFlag must be defined in the orchestration variables

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If you don t want to mess with the hosting and installation aspects of Drupal, Bryght (http:// www.bryght.com/) is a company that offers turnkey managed Drupal hosting. You sign up for this service and get access to a completely installed Drupal site. The service takes responsibility for upgrades, compatibility of modules, security issues, and stability of the servers, leaving you with the task of creating your online community using Drupal. You can even use your account as a reseller platform, selling further Drupal installations to your clients.

Let s take a look at how the code works, starting with the Imports statements:

The second kind of concrete type definition discussed in this section is a discriminated union. Here is a very simple example: type type type type Route = int Make = string Model = string Transport = | Car of Make * Model | Bicycle | Bus of Route

account or username because the principal may identify a particular system, a user, a process, or any other logical entity to which authorization and authentication may be applied. For most purposes in this chapter, however, you can think of the principal as being synonymous with user account.

Microsoft Access XML Oracle It is good to know that even though the data sources are different, the report development process stays the same; you ll only need to tweak the C# code according to the type of data source you are using. Once the dataset is ready with data, every other step to develop reports stays the same. Before we start developing our reporting projects, I d like to encourage you to learn the techniques from this chapter and then try them with your favorite data source. So, if you have a question like, Can I report on data from a MySQL database Then my answer to you is, Yes. Please check the following link for instructions to access MySQL with ADO.NET: http://dev.mysql.com/tech-resources/articles/dotnet/index.html#ADO.NET

Press F5 to debug the service. Because this is a web service, Visual Studio automatically starts the WCF Test Client. This is a very handy utility. It loads the web service and discovers the methods that are provided. They are listed in the left pane, as shown in Figure 10-10.

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