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Environment variables define the system and user environment information, and they contain information such as a drive, path, or file name. Environment variables provide information that Windows XP Professional uses to control various applications. For example, the TEMP environment variable specifies where some applications place temporary files. In the Advanced tab of the System Properties dialog box, click Environment Variables to display the system and user environment variables that are currently in effect in the Environment Variables dialog box (see Figure 5-13).

Figure 5-13

Hibernate also implements a cache for query resultsets that integrates closely with the second-level cache. This is an optional feature; it requires two additional physical cache regions that hold the cached query results and the timestamps when a table was last updated. We discuss the query cache in the next chapters because its usage is closely tied to the query being executed.

Because system environment variables apply to the entire computer, they also affect all users of the computer. During installation, Setup configures the default system environment variables, including the path to the Windows XP Professional files. Only an administrator can add, modify, or remove a system environment variable.

The user environment variables differ for each user of a particular computer. The user environment variables include any user-defined settings (such as a desktop pattern) and any variables defined by applications (such as the path to the location of the application files). Users can add, modify, or remove their user environment variables in the System Properties dialog box.

We ve already discussed the first-level cache, the persistence context, in detail. Let s go straight to the optional second-level cache The Hibernate second-level cache The Hibernate second-level cache has process or cluster scope: All persistence contexts that have been started from a particular SessionFactory (or are associ-

5-35

Windows XP Professional sets environment variables in the following order: 1. By default, Windows XP Professional searches the AUTOEXEC.BAT file, if it exists, and sets any environment variables. 2. Next, the system environment variables are set. If any system environment variables conflict with environment variables set from the search of the AUTOEXEC.BAT file, the system environment variables override them. 3. Finally, the user environment variables are set. If any user environment variables conflict with environment variables set from the search of the AUTOEXEC.BAT file or from the system environment variables, the user environment variables override them. For example, if you add the line SET TMP=C:\ in AUTOEXEC.BAT, and a TMP=X:\TEMP user variable is set, the user environment variable setting (X:\TEMP) overrides the prior setting C:\.

ated with EntityManagers of a particular persistence unit) share the same second-level cache. Persistent instances are stored in the second-level cache in a disassembled form. Think of disassembly as a process a bit like serialization (the algorithm is much, much faster than Java serialization, however). The internal implementation of this process/cluster scope cache isn t of much interest. More important is the correct usage of the cache policies caching strategies and physical cache providers. Different kinds of data require different cache policies: The ratio of reads to writes varies, the size of the database tables varies, and some tables are shared with other external applications. The second-level cache is configurable at the granularity of an individual class or collection role. This lets you, for example, enable the second-level cache for reference data classes and disable it for classes that represent financial records. The cache policy involves setting the following:

Summary

The completion of the workstation deployments signals the beginning of the life cycle s Operate phase, as shown in Figure 1-7. The Operate phase is the culmination of the two phases that preceded it. The Plan phase was concerned with what workstations to build, and the Deliver phase with the process of building them. The Operate phase is all about keeping the workstations running smoothly after they are built.

A printer is a hardware device that puts text or images on paper or on other print media. Local printers are connected to a physical port on the print server, and network interface printers are connected to a print server through the network. Network interface printers require their own NICs and have their own network address, or they are attached to an external network adapter. Before configuring a print server, you should make sure that the computer has sufficient RAM to process documents and sufficient disk space to ensure that the print server can store documents until it sends the documents to the printer.