(BUG) AWR下DB TIME非常高 bug案例

今天巡检发现AWR的 DB TIME 非常高，明显存在不符合现实。



MOS发现 该问题中了 Bug 17963187 : INCORRECT CPU USAGE IN 11.2.0.4

 

PROBLEM:

--------

very high CPU time reported

DIAGNOSTIC ANALYSIS:

--------------------

Actual CPU utilization is very low.Even CT doesn't report any slowness

 

Same issue is reported in the below bug 

 

Bug 13846587 : INCORRECT CPU USAGE IN 11.2.0.3 VS 11.2.0.2
 
DB TIME的数据通过调用AIX的thread_cputime()函数获得。
 
目前操作系统的版本是：6100-06-05-1115
对应中了AIX的bug，IV35038: THREAD_CPUTIME() RETURNS INCORRECT VALUES APPLIES TO AIX 6100-06
 
Wrong cpu usage information will be returned by the OS call thread_cputime() due to an OS bug
 
该bug会影响DB TIME有关报表的准确性，暂时未发现有其他影响。
 
 
IBM官网，该bug的信息与补丁
http://www-01.ibm.com/support/docview.wss?uid=isg1IV35038
 
 
另可参考MOS,(ID 1631769.1)
https://support.oracle.com/epmos/faces/DocumentDisplay?_afrLoop=547630631116765&id=1631769.1&displayIndex=4&_afrWindowMode=0&_adf.ctrl-state=7ssnrkw5u_138#SYMPTOM