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                # 19.2\. 二級緩存(The Second Level Cache) Hibernate的`Session`在事務級別進行持久化數據的緩存操作。 當然,也有可能分別為每個類(或集合),配置集群、或JVM級別(`SessionFactory級別`)的緩存。 你甚至可以為之插入一個集群的緩存。注意,緩存永遠不知道其他應用程序對持久化倉庫(數據庫)可能進行的修改 (即使可以將緩存數據設定為定期失效)。 通過在`hibernate.cache.provider_class`屬性中指定`org.hibernate.cache.CacheProvider`的某個實現的類名,你可以選擇讓Hibernate使用哪個緩存實現。Hibernate打包一些開源緩存實現,提供對它們的內置支持(見下表)。除此之外,你也可以實現你自己的實現,將它們插入到系統中。注意,在3.2版本之前,默認使用EhCache 作為緩存實現,但從3.2起就不再這樣了。 **表 19.1\. 緩存策略提供商(Cache Providers)** | Cache | Provider class | Type | Cluster Safe | Query Cache Supported | | --- | --- | --- | --- | --- | | Hashtable (not intended for production use) | `org.hibernate.cache.HashtableCacheProvider` | memory | yes | | EHCache | `org.hibernate.cache.EhCacheProvider` | memory, disk | yes | | OSCache | `org.hibernate.cache.OSCacheProvider` | memory, disk | yes | | SwarmCache | `org.hibernate.cache.SwarmCacheProvider` | clustered (ip multicast) | yes (clustered invalidation) | | JBoss TreeCache | `org.hibernate.cache.TreeCacheProvider` | clustered (ip multicast), transactional | yes (replication) | yes (clock sync req.) |
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