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Windows XP Professional saves files and folders in the first available space on a hard disk and not necessarily in an area of contiguous space, which can lead to file and folder fragmentation. Disk Defragmenter, a Windows XP Professional system tool, locates fragmented files and folders and defragments them, enabling your system to access and save files and folders more efficiently.

The third line in this example triggers the execution of the SQL that retrieves an Item into memory. As long as you access only the database identifier property, no initialization of the proxy is necessary. (Note that this isn t true if you map the identifier property with direct field access; Hibernate then doesn t even know that the getId() method exists. If you call it, the proxy has to be initialized.)

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A proxy is useful if you need the Item only to create a reference, for example:

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Check Disk attempts to repair file system errors, locate bad sectors, and recover readable information from those bad sectors. Disk Cleanup frees up disk space by locating temporary files, Internet cache files, and unnecessary programs that you can safely delete.

In the following case scenarios, you apply what you ve learned about subjects of this chapter. You can find answers to these questions in the Answers section at the end of this book.

Item item = (Item) session.load(Item.class, new Long(123)); User user = (User) session.load(User.class, new Long(1234)); Bid newBid = new Bid("99.99"); newBid.setItem(item); newBid.setBidder(user); session.save(newBid);

The Offline Files feature allows Windows to create a temporary copy of shared files on the network so that you can use them when you are disconnected from the network. Before you can use offline files, you must use the Folders Options selection on the Tools menu of Windows Explorer to enable the feature. After enabling Offline Files, you can use My Network Places to make any network accessible folder for which offline caching is enabled available offline.

Before taking the exam, review the key points and terms that are presented in this chapter. You need to know this information.

You first load two objects, an Item and a User. Hibernate doesn t hit the database to do this: It returns two proxies. This is all you need, because you only require the Item and User to create a new Bid. The save(newBid) call executes an INSERT statement to save the row in the BID table with the foreign key value of an Item and a User this is all the proxies can and have to provide. The previous code snippet doesn t execute any SELECT! If you call get() instead of load() you trigger a database hit and no proxy is returned. The get() operation always hits the database (if the instance isn t already in the persistence context and if no transparent second-level cache is active) and returns null if the object can t be found. A JPA provider can implement lazy loading with proxies. The method names of the operations that are equivalent to load() and get() on the EntityManager API are find() and getReference():

Windows XP Professional does not support fault-tolerant disk configurations. Spanned volumes simply allow you to use different amounts of disk space from multiple hard disks in a single volume. Striped volumes allow you use an identical amount of disk space from multiple hard disks. The advantage of using striped volumes is that Windows can write information to the disk more quickly. When you convert a basic disk to a dynamic disk, data on the disk is preserved. When you revert a dynamic disk to a basic disk, data on the disk is lost. Compressed files cannot be encrypted, and encrypted files cannot be compressed with NTFS compression. NTFS allocates disk space based on uncompressed file size. If you copy a compressed file to an NTFS volume with enough space for the compressed file, but not enough space for the uncompressed file, you might get an error message that states that there is not enough disk space for the file, and the file will not be copied to the volume.