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Automatic deletion of orphans saves you two lines of code two lines of code that are inconvenient. Without orphan deletion, you d have to remember all the Bid

Windows XP Professional supports two types of disk storage: basic disks and dynamic disks. Portable computers support only basic disks. All disks are basic disks by default. When you need to take advantage of the functionality that dynamic disks provide, you must upgrade the basic disks to dynamic disks (remember that this feature is available only in Windows XP Professional and Windows 2000 Professional). You can perform this operation with no loss of data. Windows XP Professional provides the Disk Management utility to configure, manage, and monitor hard disks and volumes. Using this utility, you can accomplish tasks such as the creation and formatting of volumes, moving disks from one computer to another, and remote disk management. You can manage disks on a remote computer by using Computer Management to connect to that computer. After connecting to the remote computer, you can use the Disk Management tool in the same way as on a local computer. You can manage disks from the command line by using the Diskpart command. Disk Management displays the status of disks and volumes. Using this status display, you can quickly determine whether disks are healthy, have errors, or are offline or missing.

objects you wish to delete the code that removes an element from the collection is often in a different layer than the code that executes the delete() operation. With orphan deletion enabled, you can remove orphans from the collection, and Hibernate will assume that they re no longer referenced by any other entity. Note again that orphan deletion is implicit if you map a collection of components; the extra option is relevant only for a collection of entity references (almost always a <one-to-many>). Java Persistence and EJB 3.0 also support transitive state changes across entity associations. The standardized cascading options are similar to Hibernate s, so you can learn them easily.

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The Java Persistence specification supports annotations for entity associations that enable cascading object manipulation. Just as in native Hibernate, each EntityManager operation has an equivalent cascading style. For example, consider the Category tree (parent and children associations) mapped with annotations:

Windows XP Professional supports two types of compression: NTFS compression and the Compressed Folders feature. NTFS compression enables you to compress files, folders, or an entire drive. NTFS compressed files and folders occupy less space on an NTFS-formatted volume, which enables you to store more data. Each file and folder on an NTFS volume has a compression state, which is either compressed or uncompressed. The Compressed Folders feature allows you to create a compressed folder so that all files you store in that folder are automatically compressed.

To learn more about using SCCM for software updates, consult the following TechNet Web page: http://technet.microsoft.com/en-us/library/bb633264.aspx.

Explain the purpose of compressed folders. Compress files, folders, or volumes by using NTFS compression.

@Entity public class Category { private String name; @ManyToOne public Category parentCategory; @OneToMany(mappedBy = "parentCategory", cascade = { CascadeType.PERSIST, CascadeType.MERGE } ) public Set<Category> childCategories = new HashSet<Category>(); ... }

The Compressed Folders feature is new in Windows XP Professional and allows you to compress folders, while retaining the ability to view and work with their contents. To create a compressed folder, start Windows Explorer, click File, click New, and then click Compressed (Zipped) Folder. This creates a compressed folder in the current folder. You can drag and drop files into the compressed folder and the files are automatically compressed. If you copy a file from the compressed folder to another that is not compressed, that file will no longer be compressed. A zipper icon is shown, marking compressed folders (see Figure 10-13), and these folders are labeled Compressed Folder. Benefits of using compressed folders generated with the Compressed Folders feature include the following: