Oracle OCP认证考试题库解析052-2

QUESTION 2

Identify the memory component from which memory may be allocated for:Session memory for the shared server, Buffers for I/O slaves 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)

Correct Answer: A

Explanation/Reference: Large Pool The large pool is an optional memory area intended for memory allocations that are larger than is appropriate for the shared pool. The large pool can provide large memory allocations for the following: UGA for the shared server and the Oracle XA interface (used where transactions interact with multiple databases) Message buffers used in the parallel execution of statements Buffers for Recovery Manager (RMAN) I/O slaves By allocating session memory from the large pool for shared SQL, the database avoids performance overhead caused by shrinking the shared SQL cache. By allocating memory in large buffers for RMAN operations, I/O server processes, and parallel buffers, the large pool can satisfy large memory requests better than the shared pool.

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