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12, Update Management, details what you need to know about security updating, but multi-role servers do have support and update management considerations unique to the platform. Because of the number of services running on the same system, it is a fact that debugging issues may be more challenging. This does not mean they are impossible to deal with, but when an issue arises, ensure that the vendors you work with understand that they are working on a multi-role server. For example, certain third-party applications may need different versions of .NET installed, and vendors need to understand their shared place on this server and not unduly change permissions, install their products on top of existing Web sites, or perform any other actions by which vendors have historically have nearly destroyed a multi-role server in the past. LOB Application Virtualization Tip When installing an LOB application, consider using Virtual Server. This places the application away from your other server roles, and will ensure that the vendor will have no ability to restrict the supportability on the multi-role server you are running the application.

Repeat this process to drag another screen linked to Start. It will be called Screen 2. Next, create another two screens linked to Screen 1. They ll be called Screen 3 and Screen 4. By the time you re finished, your screen should look something like the one shown in Figure 2-26.

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these applications, it s usually not required to compare object identity across concurrent units of work; each user should be completely isolated from other users. There is quite a strong case for this view when the underlying relational database implements a multiversion concurrency model (Oracle or PostgreSQL, for example). It s somewhat undesirable for the object/relational persistence cache to redefine the transactional semantics or concurrency model of the underlying database. Let s consider the options again. A transaction scope cache is preferred if you also use transaction-scoped object identity and is the best strategy for highly concurrent multiuser systems. This first-level cache would be mandatory, because it also guarantees identical objects. However, this isn t the only cache you can use. For some data, a second-level cache scoped to the process (or cluster) that returns data by value can be useful. This scenario therefore has two cache layers; you ll later see that Hibernate uses this approach. Let s discuss which data benefits from second-level caching or, in other words, when to turn on the process (or cluster) scope second-level cache in addition to the mandatory first-level transaction scope cache. Caching and transaction isolation A process or cluster scope cache makes data retrieved from the database in one unit of work visible to another unit of work. This may have some very nasty sideeffects upon transaction isolation. First, if an application has non-exclusive access to the database, process scope caching shouldn t be used, except for data which changes rarely and may be safely refreshed by a cache expiry. This type of data occurs frequently in content management-type applications but rarely in financial applications. You need to look out for two main scenarios involving non-exclusive access:

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While most of the site content is displayed through menus that access sections and categories, there is one page that is entirely unique: the Frontpage. The Frontpage is the home page of the site, and content from any section, category, or uncategorized article can be displayed there. For that reason, the Frontpage has a dedicated manager, as shown in Figure 5-8. The Frontpage Manager is a catch all that acts in much the same way as the Article Manager. It allows articles to be published, unpublished, reordered, and archived. Think of the Frontpage Manager as a shortcut that acts the same as an Article Manager filter, only it does so for the content that appears on the home page.

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The Sys.Net namespace contains classes focused on the communication between the browser and the server. The classes in this namespace provide the basis for doing partial-page updates and calling web services from the browser. Classes in this namespace include the Sys.Net.WebRequest class, which is covered in 10 in the web services discussion.

Why only the one parameter There are good computer-sciencephilosophical reasons for it. In mathematical logic, a predicate is usually defined as follows: P : X { true, false } That can be read as a Predicate of some entity X maps to true or false . The single parameter in the mathematical expression is an important limitation, allowing us to build more complex systems from the simplest possible building blocks. This formal notion gives rise to the single parameter in the .NET Predicate<T> class, however pragmatically useful it may be to have more than one parameter in your particular application.

SSMS has two options to present the graphical form of a showplan: the Display Estimated Execution Plan and Include Actual Execution Plan commands, which are available in the Query menu and as toolbar buttons as depicted in Figure 2-8 .