Identify the memory component from which memory may be allocated for:
1: Session memory for the shared server
2: Buffers for I/O slaves
3: Oracle Database Recovery Manager (RMAN) backup and restore operations
A.Large Pool
B.Redo Log Buffer
C.Database Buffer Cache
D.Program Global Area (PGA)
Large Pool：主要是提高效率，在大规模的 I/O 及备份和恢复操作时可能使用该区，可以通过设置 large_pool_size 来进行设置，是一个动态参数
原文：http://www.cnblogs.com/Babylon/p/7941139.html