OEM 13C ASH Analytics Page Is Blank

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 Login to the DB Server and execute below commands


SQL> select count(*) from WRH$_ACTIVE_SESSION_HISTORY;

   COUNT(*)

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

         0

         


SQL> alter system set "_ash_enable"=false;

System altered.

 


SQL> alter system set "_ash_enable"=true;

System altered.

 

Login in to OEM and Retest the issue


Reference:-

OEM Top Activity Graphs Are Not Displayed (Doc ID 2229483.1)


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