大型池（Large Pool）在SGA中是可选的缓冲区。它可以根据需要有管理权进行配置。它可以提供一个大的区以供象数据库的备份与恢复等操作。
大型池——分配给RMAN用于备份和恢复的内存。
Large Pool - Memory allocated for use by RMAN for backup and recovery.
具有大型缓冲池的环境也可能需要配置更多页面清洗器。
Environments with large buffer pools might also require more page cleaners to be configured.
例如，假设由于测试系统上的内存约束，您无法获得大型的缓冲池，并且希望将大小配置得相同，实际上却不是真正有这么大。
For example, say that you cannot afford to have large buffer pools due to memory constraints on the test system and would like to configure the size the same without actually having them in reality.
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