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You can create multiple snapshots of the same database. The only limitations are the performance overhead and the potential for the snapshots to fill the available disk space. The disk space used by a snapshot is directly determined by the amount of change in the source database. After the snapshot is first created, its footprint, or used space, is effectively zero, owing to the sparse file technology. With each change, the snapshot grows. It follows that if half of the database is modified since the snapshot was created, the snapshot would be roughly half the size of the database it was created from. Once created, a database can be reverted to its snapshot through the RESTORE DATABASE T-SQL command using the FROM DATABASE_SNAPSHOT clause as shown here (this example will fail if the AdventureWorks database contains FileStream data). During the restore process, both the source and snapshot databases are unavailable and marked In Restore.

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With the basics out of the way, we ll take a look at the more sophisticated features PowerShell provides for declaring function parameters. We ll cover untyped and typed parameters and the advantages of each. We ll cover how to handle variable numbers of arguments and, finally, how to initialize parameters. While the $args variable is a simple and automatic way of getting at the arguments to functions, it takes a fair amount of work to do anything with a level of sophistication. PowerShell provides a much more convenient (and probably more familiar) way to declare parameters, which is shown in Figure 7.1. Here s a simple example of what this looks like:

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It doesn t take a lot of effort to understand that this code is reading in numbers for lap times and fuel levels from a couple of text files the code makes this aspect of its behavior much clearer than, say, Example 2-12. When code does what it says it does, you make life much easier for anyone who has to look at the code after you ve written it. And since that probably includes you, you ll make your life easier in the long run by moving functionality into carefully named methods.

Approaches to command handling The command pattern System commands Custom commands Us gesturing at our application and our application gesturing back

1. A manager is an employee who leads engineers, technicians, and support personnel, all of whom are also employees. Focusing on the operation of going on leave, model this scenario with the Composite pattern. 2. In the Composite pattern example, the Component class has two error conditions. Implement them using exceptions, and decide whether the exceptions should be part of the IComponent interface. In general, how do you think patterns should deal with exceptions 3. The Display methods in Component and Composite assume that the type T is stringlike. Create a version of the Composite pattern where T is not a type that converts to strings (use Image, for instance) and investigate whether the Display methods can be overridden by extension methods in the namespace of the Client. 4. In the Composite class, change the List to a Dictionary class. How will this affect the Find operation 5. Although we strove to have one interface for components and composites, an alternative approach is to consider the operations that are really common and to separate out those that apply only to, for example, composites. We will then have two levels of interfaces, as in:

In .NET every application executes within an application domain. Application domains are similar to Win32 processes in many ways but differ in several important areas. The next section compares application domains to Win32 processes.

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