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Transactional Available in a managed environment only, it guarantees full transactional isolation up to repeatable read, if required. Use this strategy for read-mostly data where it s critical to prevent stale data in concurrent transactions, in the rare case of an update. Read-write This strategy maintains read committed isolation, using a timestamping mechanism and is available only in nonclustered environments. Again, use this strategy for read-mostly data where it s critical to prevent stale data in concurrent transactions, in the rare case of an update. Nonstrict-read-write Makes no guarantee of consistency between the cache and the database. If there is a possibility of concurrent access to the same entity, you should configure a sufficiently short expiry timeout. Otherwise, you may read stale data from the cache. Use this strategy if data hardly ever changes (many hours, days, or even a week) and a small likelihood of stale data isn t of critical concern. Read-only A concurrency strategy suitable for data which never changes. Use it for reference data only.

Windows XP Professional supports up to 10 simultaneous network connections. Windows XP Professional supports printing from the following clients: MS-DOS, Windows 3.1, Windows 95, Windows 98, Windows Me, Windows NT, Windows 2000, Windows Server 2003, Windows XP, and UNIX. Windows XP Professional does not support printing from NetWare or Macintosh clients.

Responsibility for the workstations now passes to the operate teams, many members of which are individuals who participated in the Deploy phase. The SMFs for the Operate phase all occur concurrently, with each one defining tasks and services that the workstations will use at various times throughout their operational lives.

Exam Highlights 11-39

Note that with decreasing strictness comes increasing performance. You have to carefully evaluate the performance of a clustered cache with full transaction isolation before using it in production. In many cases, you may be better off disabling the second-level cache for a particular class if stale data isn t an option! First benchmark your application with the second-level cache disabled. Enable it for good candidate classes, one at a time, while continuously testing the scalability of your system and evaluating concurrency strategies. It s possible to define your own concurrency strategy by implementing org. hibernate.cache.CacheConcurrencyStrategy, but this is a relatively difficult task and appropriate only for rare cases of optimization. Your next step after considering the concurrency strategies you ll use for your cache candidate classes is to pick a cache provider. The provider is a plug-in, the physical implementation of a cache system.

Users running Windows XP Professional must be members of the Administrators or Power Users groups to install a printer. You can configure multiple logical printers for a single printer to control how the printer is used in different circumstances or by different users. You can also create a printer pool to configure multiple printers for a single logical printer.

local printer A printer that is connected to a physical port on the print server. logical printer The software configuration that is created in Windows and displayed in Printers And Faxes. network interface printer A printer that is connected directly to the network via an internal network adapter. print job A document that Windows has prepared for printing. print server The computer or other remote device that has a network printer physically connected to it. printer The physical device used for printing. This device is usually a standard printer, but it can also be a fax device, a plotter, or a file. It might also refer to the combination of the physical and logical printer. printer driver A file or set of files containing information that Windows XP Professional requires to convert print commands into a specific printer language. printer pool A printing option that permits you to attach two or more printers to a single printer configuration. printer port A software interface through which a computer communicates with a printer by means of a locally attached interface. printer priority Governs the order in which print jobs are printed relative to other logical printers configured for the same printer.

Choosing a cache provider For now, Hibernate forces you to choose a single cache provider for the whole application. Providers for the following open source products are built into Hibernate:

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EHCache is a cache provider intended for a simple process scope cache in a single JVM. It can cache in memory or on disk, and it supports the optional Hibernate query result cache. (The latest version of EHCache now supports clustered caching, but we haven t tested this yet.) OpenSymphony OSCache is a service that supports caching to memory and disk in a single JVM, with a rich set of expiration policies and query cache support. SwarmCache is a cluster cache based on JGroups. It uses clustered invalidation but doesn t support the Hibernate query cache. JBoss Cache is a fully transactional replicated clustered cache also based on the JGroups multicast library. It supports replication or invalidation, synchronous or asynchronous communication, and optimistic and pessimistic locking. The Hibernate query cache is supported, assuming that clocks are synchronized in the cluster.

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