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Memory usage is usually the first item to look at when experiencing performance problems. If you find that your system is paging frequently, you probably need more memory. Some paging is expected to expand memory, but too much paging is a drain on system performance. Note Paging is used to free memory for other uses by moving fixed-size blocks of data and code from RAM to your disk in units called pages. Before monitoring memory usage, perform a few checks. For example, verify that your system has the recommended amount of memory for running the operating system as well as other applications and services. If you don t know

Waiting for workflow completion (25 seconds...). The workflow is: Initialized Workflow instance terminated, reason: 'User cancellation'. Done.

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Before we leave the topic of workflow instances, I want to touch on the concept of dehydrating and rehydrating an instance. If you have long-running workflow tasks or have a large number of tasks executing, you can unload tasks and store the necessary execution context information in a SQL Server database using a service that ships with WF. The goal is to unload workflow tasks and store them temporarily only to later reload them when the time is right. We ll save a detailed discussion for 6, but I mention it here because, for one thing, this process targets the workflow instance. But for another, you might hear the terms, and I didn t want you to have to wade too far into the book without understanding their basic meaning. When you dehydrate an instance, you re removing it from execution status and storing it away for later recall. Typically, we use the persistence service that comes with WF for this, but you can write your own service to perform the same task. Later, when your application senses the trigger for restarting the workflow instance, you rehydrate the instance and bring it back into an executing state. There are a number of reasons for doing this, all of which we ll examine briefly later in the book.

what the memory requirements are for a process, you can discover its working set within System Monitor. Shut the process down and observe the effect on paging activity. The amount of memory that is freed when you terminate a process is the amount of memory the process was using. Note

Although the X.509 version 1 certificate format provides basic information about the certificate holder, the format offers little information about the certificate issuer. By including only the issuer, issuer name, CA signature algorithm, and signature value, the version 1 format does not provide any provisions for CA renewal. When a CA s certificate is renewed, two certificates possess the same Issuer Name field value. Likewise, it is possible for another organization to create a CA with the same issuer name. To address this, the X.509 version 2 certificate format was introduced in 1993. The version 2 format introduced two new fields to the cer tificate. (See Figure 2-2.)

To Start a workflow instance without parameters Start a workflow instance with parameters Do This Use the WorkflowRuntime object s CreateWorkflow method, passing in the type of the workflow definition. Use the WorkflowRuntime object s CreateWorkflow method, passing in the type of the workflow definition along with a generic Dictionary object that contains the parameters. The key for each value should be a string that matches a public property of the workflow definition. The value should simply be an object. Request the workflow definition from the executing workflow instance, and query the activity s ExecutionStatus property. Call the Terminate method exposed by the WorkflowInstance object.

To check for possible memory leaks or bottlenecks, monitor these counters:

from disk to resolve hard page faults. A hard page fault occurs when a process requires code or data that must be retrieved from disk rather than from its working set or elsewhere in physical memory. If this value is above 20 per pagefile, you need to research paging activity and make adjustments as necessary. A high value for this counter might be more indicative of a paging problem than a memory problem.

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of virtual memory on your system and is an instantaneous counter. Monitor this counter, along with Memory\ Available Bytes, over a period of time if you suspect a memory leak.