Oracle monitoring dosn't show some performance

Oracle monitoring dosn't show some performance

Hi,

We are going to test the Application Manager to monitor Oracle databases for this we have installed application manager on  a linux server and we created the required user on database and successfully add a oracle server to it , now we can see some performance report but problem is that some of other performance monitor is empty and show "No Data Available" for example we can see "Performance of the Data files" but "Tablespace Details" and "Tablespace Status" are empty and show "No Data Available"

Thanks,

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