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Use the following questions to help determine whether you have learned enough to move on to the next lesson. If you have difficulty answering these questions, review the material in this lesson before beginning the next lesson. You can find answers to these questions in the Questions and Answers section at the end of this chapter. 1. What are two advantages of sharing a printer

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In this case, each unit of work retrieves its own copy of the state (think about raw data), and resulting persistent instances aren t identical The scope of the cache and the scope of object identity are no longer the same A cluster scope cache always needs remote communication, and in the case of POJO-oriented persistence solutions like Hibernate, objects are always passed.

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3. Which of the following statements about a printing pool in Windows XP Professional are correct Choose all that apply. a. All printers in a printing pool must be network interface printers. b. A printing pool consists of two or more identical printers that are connected to one print server and act as a single printer. c. If you use printers that are not identical, they must use the same printer driver. d. If you use printers that are not identical, you must install all the required printer drivers on the print server. 4. Why would you create virtual printers and vary the priorities on them

remotely by value A cluster scope cache therefore can t guarantee identity across a cluster For typical web or enterprise application architectures, it s most convenient that the scope of object identity be limited to a single unit of work In other words, it s neither necessary nor desirable to have identical objects in two concurrent threads In other kinds of applications (including some desktop or fat-client architectures), it may be appropriate to use process scoped object identity This is particularly true where memory is extremely limited the memory consumption of a unit of work scoped cache is proportional to the number of concurrent threads However, the real downside to process-scoped identity is the need to synchronize access to persistent instances in the cache, which results in a high likelihood of deadlocks and reduced scalability due to lock contention.

To share an existing printer, use the Sharing tab of the Properties dialog box for the printer and select Share This Printer. If you expect network users of a shared printer to have computers that are running different versions of Windows, you can install different drivers so that they are automatically available to users who connect to the printer. To stop sharing a printer, in the Properties dialog box for the printer, on the Sharing tab, click Not Shared. A printer pool consists of two or more identical printers that are connected to one print server and act as a single printer. Setting priorities on virtual printers makes it possible for users to send critical documents to a high-priority printer and noncritical documents to a lower-priority printer, even when there is only one physical printer.

When deploying Windows 7, you can use an answer file to automate the process of partitioning the disk on which you intend to install Windows 7.

Troubleshooting Setup and Configuration Problems 11-33

Caching and concurrency Any ORM implementation that allows multiple units of work to share the same persistent instances must provide some form of object-level locking to ensure synchronization of concurrent access Usually this is implemented using read and write locks (held in memory) together with deadlock detection Implementations like Hibernate that maintain a distinct set of instances for each unit of work (unit of work-scoped identity) avoid these issues to a great extent It s our opinion that locks held in memory should be avoided, at least for web and enterprise applications where multiuser scalability is an overriding concern In these applications, it usually isn t required to compare object identity across concurrent units of work; each user should be completely isolated from other users There is a particularly strong case for this view when the underlying relational database implements a multiversion concurrency model (Oracle or PostgreSQL, for example).

During setup and configuration of a printer, problems can occur. This lesson introduces you to a few common problems that you might encounter and provides some suggested solutions.

Troubleshoot a printer setup problem by using the Windows troubleshooters Offer possible solutions to common troubleshooting scenarios