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Security Center is an entirely new feature provided by Windows XP Service Pack 2. The Security Center service runs as a background process in Windows XP and routinely checks the status of the following components: Windows Firewall Security Center detects whether Windows Firewall is enabled or disabled. Security Center can also detect the presence of some third-party software firewall products. Automatic Updates Security Center detects the current Automatic Updates setting in Windows XP. If Automatic Updates is turned off or not set to the recommended settings, the Security Center provides appropriate recommendations. Virus Protection Security Center detects the presence of antivirus software from many third-party organizations. If the information is available, the Security Center service also determines whether the software is up-to-date and whether real-time scanning is turned on. When Security Center is running, its presence is indicated by an icon in the notification area on the Windows taskbar, as shown in Figure 1-1. When Security Center detects an important security condition (such as improper settings), it displays a pop-up notice in the notification area.

Figure 1-1 The Security Center icon in the notification area provides access to the Security Center window and alerts the user to security conditions.

The application performs a lookup by identifier (primary key). The persistence layer resolves an association or collection lazily.

Right-click Select A Windows Image Or Catalog File, and from the context menu, choose Select Windows Image. The Select A Windows Image dialog box appears. Insert the Windows 7 installation disk into the DVD drive, browse to the Sources folder on the disk, select the Install.wim file, and click Open. The image appears in the Windows Image box, as shown in Figure 6-13. Depending on the installation disk you use, you might have to select a specific Windows 7 image from those on the disk.

You can also double-click the Security Center icon in the notification area to open the main Security Center window, shown in Figure 1-2. The Security Center window provides the following information:

Resources where you can learn more about security-related issues. An indication of whether Windows Firewall is enabled or disabled, as well as a shortcut for opening the Windows Firewall dialog box.

It s also possible to cache the results of queries. As you ll see in the chapter 15, the performance gain of caching query results is minimal in many cases, so this functionality is used much less often. Before we look at how Hibernate s cache works, let s walk through the different caching options and see how they re related to identity and concurrency.

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1

Caching is such a fundamental concept in object/relational persistence that you can t understand the performance, scalability, or transactional semantics of an ORM implementation without first knowing what kind of caching strategy (or strategies) it uses. There are three main types of cache:

The current configuration for Automatic Updates, as well as a link for changing Automatic Updates settings. The current status of antivirus software installed on the computer. For some antivirus products, Security Center can also determine whether the antivirus software is up-to-date. Additional shortcuts for opening the Internet Options and System dialog boxes.

Figure 1-2 The Security Center window provides a central interface for managing security on a computer running Windows XP .

Transaction scope cache Attached to the current unit of work, which may be a database transaction or even a conversation. It s valid and used only as long as the unit of work runs. Every unit of work has its own cache. Data in this cache isn t accessed concurrently. Process scope cache Shared between many (possibly concurrent) units of work or transactions. This means that data in the process scope cache is

If you are running firewall or antivirus software that is not detected by Security Center, Security Center presents options for bypassing alerts for that component. If you see a Recommendations button, you can use it to open a window that allows you to disable alerts or research any appropriate third-party products.