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Windows XP Professional has been designed to provide the optimum performance on any hardware configuration without any adjustments. In fact, most users never need to monitor or modify the performance of their Windows XP system. There are also times when an administrator who has a detailed understanding of system performance monitoring and tuning can improve a system s performance. For these administrators, Windows XP provides a suite of tools useful for monitoring, analyzing, and tuning system performance characteristics. The most commonly used tool is the Task Manager, which displays real-time information about network utilization and users in addition to monitoring applications, processes, and performance. The Performance console is a more powerful utility for analyzing system performance because it provides real-time information about hundreds of detailed aspects of the system s performance including memory utilization, shared folders, and network errors. You can also use the Performance console to alert when counters reach a specific threshold, which enables you to detect impending problems such as low disk space or high memory utilization before they cause the computer to slow down. Windows XP Professional provides the Scheduled Tasks to allow tasks to be executed when the computer is not being actively used. If you prefer, you can use the AT command-line utility to schedule tasks.

When the mounting process is completed, type the following command to display information about the mounted image and press Enter:

@Basic(optional = false) @Column(nullable = false) public BigDecimal getInitialPrice { return initialPrice; }

The first step in troubleshooting USB problems is to check the BIOS setup to make sure that the USB function is enabled for the computer. Table 6-5 describes basic USB troubleshooting procedures.

Table 6-5

The @Basic annotation marks the property as not optional on the Java object level. The second setting, nullable = false on the column mapping, is only responsible for the generation of a NOT NULL database constraint. The Hibernate JPA implementation treats both options the same way in any case, so you may as well use only one of the annotations for this purpose. In a JPA XML descriptor, this mapping looks the same:

Do This Check Device Manager to make sure that the USB controller appears there. In Windows XP, the USB controller should be listed under the Universal Serial Bus Controllers entry (using the default Devices By Type view in Device Manager).

The controller does not Contact the BIOS manufacturer for an updated copy of the appear in Device Manager, BIOS because the computer s BIOS might be outdated. or a yellow warning icon appears next to the controller. The controller is present in Device Manager. Right-click the USB controller, and then select Properties. If there are any problems, a message should appear in the Device Status section on the General tab of the controller s Properties dialog box. Check the USB port drivers next. USB ports are listed in Device Manager as USB Root Hubs. Right-click a USB Root Hub entry, and then select Properties. Use the Driver tab of the USB Root Hub Properties dialog box to update or roll back drivers, if necessary.

<entity class="auction.model.Item" access="PROPERTY"> <attributes> ... <basic name="initialPrice" optional="false"> <column nullable="false"/> </basic> </attributes> </entity>

6-22

6

Quite a few options in Hibernate metadata are available to declare schema constraints, such as NOT NULL on a column. Except for simple nullability, however, they re only used to produce DDL when Hibernate exports a database schema from mapping metadata. We ll discuss customization of SQL, including DDL, in chapter 8, section 8.3, Improving schema DDL. On the other hand, the Hibernate Annotations package includes a more advanced and sophisticated data validation framework, which you can use not only to define database schema

When troubleshooting USB devices, you must be aware that the problem could be a result of general USB issues or be a problem with the device itself. Usually, but not always, general USB issues affect more than one device. If you suspect a problem with a specific device, uninstall the device by using Device Manager, disconnect the device from the computer, and then restart the computer. After the computer restarts, reconnect the device and let Plug and Play detect, install, and configure it again. If the device still does not function correctly, investigate the possibility that the device is damaged in some way or that you need to obtain updated drivers from Microsoft or the device manufacturer.