日期:2014-05-16 浏览次数:20693 次
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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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