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After spending the first half of this chapter almost exclusively on entities and the respective basic persistent class-mapping options, we ll now focus on value types in their various forms. Two different kinds come to mind immediately: value-typed classes that came with the JDK, such as String or primitives, and value-typed classes defined by the application developer, such as Address and MonetaryAmount. First, you map persistent class properties that use JDK types and learn the basic mapping elements and attributes. Then you attack custom value-typed classes and map them as embeddable components.

Monitor and Configure Multiprocessor Computers 23-37

C. Replace the new processor with a functioning processor. D. Start Recovery Console and insert the Windows XP Professional CD-ROM. Use Recovery Console to copy the multiprocessor kernel and HAL files that match the computer s hardware configuration. Rename the files as needed.

If you map a persistent class, no matter whether it s an entity or a value type, all persistent properties have to be mapped explicitly in the XML mapping file. On the other hand, if a class is mapped with annotations, all of its properties are considered persistent by default. You can mark properties with the @javax.persistence.Transient annotation to exclude them, or use the transient Java keyword (which usually only excludes fields for Java serialization). In a JPA XML descriptor, you can exclude a particular field or property:

23-38

23

<entity class="auction.model.User" access="FIELD"> <attributes> ... <transient name="age"/> </attributes> </entity>

At the computer on which you installed the Windows 7 AIK, insert your Windows 7 installation DVD (canceling autoplay, if necessary) and using Windows Explorer, create a folder called Image in the C:\Users folder and copy the Install.wim file from the Sources folder on the DVD to C:\Users\Image. Using Windows Explorer, create an empty folder called Mount in your C:\Users folder. On the Start menu, open the Windows AIK program group, right-click Deployment Tools Command Prompt and, from the context menu, select Run As Administrator. In the Administrator: Deployment Tools Command Prompt window, type the following command all on one line to mount the image and press Enter:

Correct Answers: B A. Incorrect: Although 85 percent is a very high sustained value for this counter, and the user probably could benefit from faster processors, the computer should continue to function acceptably because there is still 15 percent idle processor time. The average for the Interrupts per second suggests why the percent processor time might be running so high. B. Correct: You must establish an acceptable baseline for Interrupts per second on a system performing nominally while under load. A generally considered acceptable starting point is 1,000 to 2,000 interrupts per second. 6,500 interrupts per second indicates a serious performance problem. You could further analyze the impact of the problem by watching the % Interrupt Time counter, which measures the percentage of the processor s time that is consumed by handling interrupt requests. Most likely, this problem is caused by a network adapter, although many different hardware devices could theoretically be responsible. Try updating the BIOS on the network adapter and the Windows XP Professional drivers for the adapter. If that procedure does not resolve the problem, replace the adapter. C. Incorrect: This counter measures the number of times Windows XP has to access the paging file. If this counter were high, it would indicate that applications are using significantly more memory than the computer has physical RAM available. However, 1.5 is a very low count and is not indicative of a problem. D. Incorrect: For this counter, 1.8 is an acceptable average. Because it is greater than 1, it indicates that the computer s processor is not handling instructions quite as fast as it is receiving them. However, the % Processor Time counter indicates that the computer should continue to function in an acceptable manner.

Correct Answers: D A. Incorrect: Even safe mode will fail to start when you have the incorrect kernel installed. Additionally, you cannot use hardware profiles to support both uniprocessor and multiprocessor configurations. B. Incorrect: This would solve the problem because Setup would detect the second processor and install the multiprocessor kernel. However, it would also result in the user losing his operating system settings. It would be more efficient to replace the kernel file by using Recovery Console. C. Incorrect: The question provides no information that should lead you to believe the processor is not functioning correctly. Windows XP does not automatically switch between uniprocessor and multiprocessor HALs, so the uniprocessor HAL and kernel files need to be replaced.