[每日一题] 11gOCP 1z0-053 :2013-10-13 MEMORY_TARGE初始化参数..................................51

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正确答案ABC

   这道题比较简单,MEMORY_TARGET参数是Oracle11g中才有的,下面我们这幅图很清楚的描述了Oracle内存的关系:

 


参数memory_max_target、 memory_target、sga_max_size、sga_target、pga_aggregate_target的关系:

 (1)   sga_target=0 ,pga_aggregate_target=0 -〉完全自动管理,SGA=memory_target*60%   PGA=memory_target*40%
 (2)   sga_target=600(最小值) ,pga_aggregate_target=200(最小值) -〉memory_target=sga_target+pga_aggregate_target
 (3)   sga_target=600,pga_aggregate_target=0  -〉pga_aggregate_target=memory_target-sga_target
 (4) sga_target=0,pga_aggregate_target=200  -〉sga_target=memory_target-pga_aggregate_target 


答案解析:

答案A正确,memory_target参数的值可以小等等于memory_max_target参数的值,看下面的图。



答案B正确,如果memory_target参数不设,那么memory_max_target默认为0

答案C正确,如上图1-1,memory_target包括PGA和SGA

答案D不正确,memory_target参数可以直接在内存上修改,马上生效而无须重启数据库。

gyj@OCM> select ISSYS_MODIFIABLE  from v$parameter where name='memory_target';  ISSYS_MOD --------- IMMEDIATE gyj@OCM> show parameter memory_target  NAME                                 TYPE        VALUE ------------------------------------ ----------- ------------------------------ memory_target                        big integer 804M sys@OCM> alter system set memory_target=900M;  System altered.  sys@OCM> show parameter memory_target  NAME                                 TYPE        VALUE ------------------------------------ ----------- ------------------------------ memory_target                        big integer 900M 

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