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Whether the second-level cache is enabled The Hibernate concurrency strategy The cache expiration policies (such as timeout, LRU, and memory-sensitive) The physical format of the cache (memory, indexed files, cluster-replicated)

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Not all classes benefit from caching, so it s important to be able to disable the second-level cache. To repeat, the cache is usually useful only for read-mostly classes. If you have data that is updated much more often than it s read, don t enable the second-level cache, even if all other conditions for caching are true! The price of maintaining the cache during updates can possibly outweigh the performance benefit of faster reads. Furthermore, the second-level cache can be dangerous in systems that share the database with other writing applications. As explained in earlier sections, you must exercise careful judgment here for each class and collection you want to enable caching for. The Hibernate second-level cache is set up in two steps. First, you have to decide which concurrency strategy to use. After that, you configure cache expiration and physical cache attributes using the cache provider. Built-in concurrency strategies A concurrency strategy is a mediator: It s responsible for storing items of data in the cache and retrieving them from the cache. This is an important role, because it also defines the transaction isolation semantics for that particular item. You ll

To install and share a local printer, use the Add Printer Wizard on the print server. Sharing a local printer makes it possible for multiple users on the network to utilize it. In larger companies, most printers are network interface printers. To install a network interface printer, use the Add Printer Wizard and specify the port information for the printer (such as a network address). Clients can connect to a shared printer by using the Add Printer Wizard, by connecting directly to the printer (using My Network Places, the Run dialog box, or the Command Prompt), by using a Web browser, or by searching Active Directory. 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. You can also create two advanced printer configurations:

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.

have to decide, for each persistent class and collection, which cache concurrency strategy to use if you want to enable the second-level cache. The four built-in concurrency strategies represent decreasing levels of strictness in terms of transaction isolation:

Windows XP Professional helps you interactively troubleshoot problems you encounter. To troubleshoot printing problems, you can use the printing troubleshooter. You should also learn to resolve common problems such as improper printer drivers, improper ports, and low ink or toner.

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