Unlike the shared pool, the large pool does not have an LRU list. Oracle Database does not attempt to age objects out of the large pool. Consider configuring a large pool if the database instance uses any of the following Oracle Database features:
与共享池不同,大型吃没有Least Recent Used List.Oracle并不是尝试去从large pool清理不常用的对象.考虑配置large pool如果数据库实例使用如下的特性:

• Shared server

  In a shared server architecture, the session memory for each client process is included in the shared pool.
  共享服务器.
  在一个共享服务器结构中,session的内存是在共享池中                                                                                   

• Parallel query

  Parallel query uses shared pool memory to cache parallel execution message buffers.
  并行查询.
  并行查询使用共享池听哦缓存并行执行的内容

• Recovery Manager

  Recovery Manager (RMAN) uses the shared pool to cache I/O buffers during backup and restore operations. For I/O server processes, backup, and restore operations, Oracle Database allocates buffers that are a few hundred kilobytes in size.
  RMAN使用共享池来缓存 IO在备份和还原过程中.对于服务器进程的IO.备份,还原.Oracle分配100K以上的空间

This section describes how to configure the large pool for the shared server architecture and contains the following topics: