OCP-1Z0-053-V12.02-66题

66.Which two initialization parameters would you set to enable Automatic Shared Memory Management?

(Choose two.)

A. set SHARED_POOL_SIZE to zero

B. set STATISTICS_LEVEL to BASIC

C. set SGA_TARGET to a non-zero value

D. set DB_CACHE_SIZE to a non-zero value

E. set STATISTICS_LEVEL to TYPICAL or ALL

Answer: AC
答案解析：
参考：/article/1629010.html

启用ASMM 的具体过程取决于是从手动共享内存管理模式更改为 ASMM，还是从自动内存管理模式更改为ASMM。要从手动共享内存管理模式更改为 ASMM，执行以下操作：
1. 运行以下查询获取SGA_TARGET的值：
SELECT ((SELECT SUM(value) FROM V$SGA) - (SELECT CURRENT_SIZE FROM
V$SGA_DYNAMIC_FREE_MEMORY)) “SGA_TARGET” FROM DUAL;

2. 设置SGA_TARGET的值：
ALTER SYSTEM SET SGA_TARGET= value [SCOPE={SPFILE|MEMORY|BOTH}]
其中value是在步骤1 中计算的值，或者是介于所有SGA 组件的总大小与SGA_MAX_SIZE之间的某个值。

3. 将自动设置大小的SGA 组件的值设置为0。为此，需要编辑文本初始化参数文件，或者发出ALTER SYSTEM语句。如果需要，重新启动实例。
SGA组件：

sys@TEST0924> select * from v$sgainfo;

NAME BYTES RES
-------------------------------- ---------- ---
Fixed SGA Size 2232960 No
Redo Buffers 16326656 No
Buffer Cache Size 1795162112 Yes
Shared Pool Size 637534208 Yes
Large Pool Size 16777216 Yes
Java Pool Size 16777216 Yes
Streams Pool Size 16777216 Yes
Shared IO Pool Size 0 Yes
Granule Size 16777216 No
Maximum SGA Size 3340451840 No
Startup overhead in Shared Pool 117967168 No
Free SGA Memory Available 838860800

12 rows selected.