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It is very common to want to wrap usage of a proxy in another class that has some additional capabilities in terms of interacting with the remote service. The generic term for these more capable objects that facilitate access to a remote service is service agent. The following are some reasons you might want to wrap access to a proxy in a service agent: The client might have limited or unpredictable connectivity, or the consumer might simply need to operate in an offline mode. Performance problems associated with service calls might necessitate actions such as client-side caching, request batching, aggregate result disassembly, and so on. A proxy class might be very awkward or inefficient to work with, for example, taking several calls that could be wrapped up into one by an agent. In Exercise 4 in this lesson, you will see a very simple example of when you might use an agent. In the lab that follows Lesson 2, you will see an even better example of a service agent being used.

The graphical execution plan is a useful tool for optimizing queries. This chapter discusses several execution plans. Some of the items that you should look for in the execution plan are shown in Table 6-3.

1. If you want to generate a proxy class that uses the XmlSerializer, which of the four methods for generating a proxy would be best to use 2. Does it ever make sense to invoke a OneWay operation asynchronously

A thick arrow represents a large number of rows moving from one operation in the execution plan to another. The greater the number of rows transferred from one operation to another, the thicker the arrow. If a hash operation is used to handle clauses such as GROUP BY and JOIN, it often means that an appropriate index did not exist to optimize the query.

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A sort isn t necessarily bad, but if it is a high percentage of the query cost, you should consider whether an index can be built to remove the need for the sort operation.

Quick Check Answers 1. The only way to generate a proxy if you want to use the XmlSerializer is to use the svcutil command-line tool with the /serializer:XmlSerializer option. Adding a service reference in Visual Studio does not support this option. As long as the contract specifies usage of the XmlSerializer, dynamically creating a proxy object by using the ChannelFactory class would also ensure that the right serializer is used, but in that case, you are generating an object dynamically rather than a class. Similarly, if you hand-code a proxy class, you are not technically generating a class and, again, the right serializer depends on whether the contract is declared to use the XmlSerializer. 2. Yes. If there is a situation in which a message being sent to a service in a OneWay operation was very large and therefore time-consuming, it can still make sense to invoke the operation asynchronously. Keep in mind that, as was discussed in 1, OneWay calls on the proxy complete only when the dispatcher on the service end has successfully dispatched the incoming message to a call on a service type instance. If the message is large, this can take longer to happen than you would like to wait in a synchronous invocation setting, thereby making asynchronous invocation an attractive alternative.

The plan with fewer operations is typically the better optimized plan. A clustered index scan and a table scan indicate that no appropriate index can be used to optimize the query.

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