After an upgrade from Oracle Enterprise Manager 12c to version 13c, we noticed that we had lost the "Top Activity" option, that used to be in the Performance Menu of the database page.
Seen here is the Performance Menu of the version 13 of Oracle Enterprise Manager.
Below the "Performance Home" option the "Top Activity" option was available in version 12c
As you can see however, we are still able to access the screen.
It does still exist. It is only that the menu option is gone.
Luckily we kept the old http-link from version 12c, which we had saved as a Favorite in the browser.
Accessing this page was now possible by simply editing this saved link and changing the server name.
For all of you who didn't save this link and also upgraded to the new version, the link looks like this:
https://<your oem13 server>:7803/em/faces/sdk/nonFacesWrapper?target=<SID>&_em.coBM=%2Fconsole%2Fdatabase%2Finstance%2FwaitDetails%3F_em.coIFR%3Dtrue%26event%3DdoLoad%26target%3D<SID>%26type%3Doracle_database%26datasource%3DSQL%26waitClass%3DOverview&type=oracle_database
Replace <your oem13 server> with the hostname of your Oracle Enterprise Manager server and <SID> with the database instance you want to monitor.
Keep in mind that this page requires the Oracle Diagnostic Pack license to access.
If you have the license, you can enable the Diagnostic Pack via Setup => Management Pack => Management Pack Access.
You can also enable it from SQLplus by entering the command:
SQL> alter system set control_management_pack_access='DIAGNOSTIC' scope=both;
