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It s somewhat undesirable for the object/relational persistence cache to redefine the transactional semantics or concurrency model of the underlying database Let s consider the options again A transaction/unit of work-scoped cache is preferred if you also use unit of work-scoped object identity and if it s the best strategy for highly concurrent multiuser systems This first-level cache is mandatory, because it also guarantees identical objects However, this isn t the only cache you can use For some data, a second-level cache scoped to the process (or cluster) that returns data by value can be a useful This scenario therefore has two cache layers; you ll later see that Hibernate uses this approach..

Windows XP Professional helps you interactively troubleshoot problems you encounter. To troubleshoot problems with a printer, click Start, click Control Panel, and then click Printers And Other Hardware. In the Printers And Other Hardware window, under Troubleshooters, click Printing. The Help And Support Center window appears with the printing troubleshooter displayed, as shown in Figure 11-11.

Figure 11-11

Let s discuss which data benefits from second-level caching in other words, when to turn on the process (or cluster) scope second-level cache in addition to the mandatory first-level transaction scope cache. Caching and transaction isolation A process or cluster scope cache makes data retrieved from the database in one unit of work visible to another unit of work. This may have some nasty side effects on transaction isolation. First, if an application has nonexclusive access to the database, process scope caching shouldn t be used, except for data which changes rarely and may be safely refreshed by a cache expiry. This type of data occurs frequently in content management-type applications but rarely in EIS or financial applications. There are two main scenarios for nonexclusive access to look out for:

Notice the series of questions on the page. As you respond to these questions, the troubleshooter asks additional questions and makes suggestions to resolve your problem based on the answers you provide.

Any application that is designed to scale must support clustered operation. A process scope cache doesn t maintain consistency between the different caches on different machines in the cluster. In this case, a cluster scope (distributed) second-level cache should be used instead of the process scope cache. Many Java applications share access to their database with other applications. In this case, you shouldn t use any kind of cache beyond a unit of work scoped first-level cache. There is no way for a cache system to know when the legacy application updated the shared data. Actually, it s possible to implement application-level functionality to trigger an invalidation of the process (or cluster) scope cache when changes are made to the database, but we don t know of any standard or best way to achieve this. Certainly, it will never be a built-in feature of Hibernate. If you implement such a solution, you ll most likely be on your own, because it s specific to the environment and products used. After considering nonexclusive data access, you should establish what isolation level is required for the application data. Not every cache implementation respects all transaction isolation levels and it s critical to find out what is required. Let s look at data that benefits most from a process- (or cluster-) scoped cache. In practice, we find it useful to rely on a data model diagram (or class diagram) when we make this evaluation. Take notes on the diagram that express whether a particular entity (or class) is a good or bad candidate for second-level caching. A full ORM solution lets you configure second-level caching separately for each class. Good candidate classes for caching are classes that represent

11-34

11

Data that changes rarely Noncritical data (for example, content-management data) Data that is local to the application and not shared

Table 11-5 lists some of the common setup and configuration problems that you might encounter. It also gives probable causes of the problems and possible solutions.

In Windows SIM, in the Windows Image box, browse to the Microsoft-Windows-Setup_ 6.1.7600.16385_neutral\DiskConfiguration\Disk\CreatePartitions\CreatePartition container, as shown in Figure 6-15. The exact folder name varies depending on the Windows 7 version you are using.

Table 11-5