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Session session = sessionFactory.openSession(); Transaction tx = session.beginTransaction(); for ( int i=0; i<100000; i++ ) { Item item = new Item(...); session.save(item); if ( i % 100 == 0 ) { session.flush(); session.clear(); } } tx.commit(); session.close();

You use disk quotas to manage storage growth in distributed environments. Disk quotas allow you to allocate disk space to users based on the files and folders that they own. You can set disk quotas, quota thresholds, and quota limits for all users and for individual users. You can also monitor the amount of hard disk space that users have used and the amount that they have left against their quota.

After this lesson, you will be able to Describe the purpose of disk quotas Set disk quotas for users Determine the status of disk quotas Monitor disk quotas Identify guidelines for using disk quotas Estimated lesson time: 30 minutes

If you have not done so already, log on to computer WKSTN1 with the Mark Lee user account. Locate the Microsoft Baseline Security Analyzer installation file. Double-click this file to begin the installation. You will receive a security warning informing you that the file has been obtained from the Internet. Click Run to start the installation process. On the Microsoft Baseline Security Analyzer Setup page, click Next. On the License Agreement page, select the I Accept The License Agreement option, and then click Next.

Here you create and persist 100,000 objects, 100 at a time. Again, remember to set the hibernate.jdbc.batch_size configuration property to an equivalent value and disable the second-level cache for the persistent class. Caveat: Hibernate silently disables JDBC batch inserts if your entity is mapped with an identity identifier generator; many JDBC drivers don t support batching in that case.

Windows XP Professional tracks disk quotas and controls disk usage on a per-user, pervolume basis. Windows XP Professional tracks disk quotas for each volume, even if the volumes are on the same hard disk. Because quotas are tracked on a per-user basis, every user s disk space is tracked regardless of the folder in which the user stores files. Disk quotas can be applied only to Windows XP Professional NTFS volumes. Table 10-2 describes the characteristics of Windows XP Professional disk quotas.

Table 10-2

Another option that completely avoids memory consumption of the persistence context (by effectively disabling it) is the StatelessSession interface.

Description Windows XP Professional calculates disk space usage for users based on the files and folders that they own. When a user copies or saves a new file to an NTFS volume or takes ownership of a file on an NTFS volume, Windows XP Professional charges the disk space for the file against the user s quota limit. Windows XP Professional ignores compression when it calculates hard disk space usage. Users are charged for each uncompressed byte, regardless of how much hard disk space is actually used. This is done partially because file compression produces different degrees of compression for different types of files. Different uncompressed file types that are the same size might end up being very different sizes when they are compressed. When you enable disk quotas, the free space that Windows XP Professional reports to applications for the volume is the amount of space remaining within the user s disk quota limit.

10-40

The persistence context is an essential feature of the Hibernate and Java Persistence engine. Without a persistence context, you wouldn t be able to manipulate object state and have Hibernate detect your changes automatically. Many other things also wouldn t be possible. However, Hibernate offers you an alternative interface, if you prefer to work with your database by executing statements. This statement-oriented interface, org.hibernate.StatelessSession, feels and works like plain JDBC, except that you get the benefit from mapped persistent classes and Hibernate s database portability. Imagine that you want to execute the same update all item objects procedure you wrote in an earlier example with this interface:

10

You use disk quotas to monitor and control hard disk space usage. System administrators can do the following:

Session session = sessionFactory.openStatelessSession(); Transaction tx = session.beginTransaction(); ScrollableResults itemCursor = session.createQuery("from Item").scroll(); while ( itemCursor.next() ) { Item item = (Item) itemCursor.get(0); modifyItem(item); session.update(item); } tx.commit(); session.close();