When you end an SQL performance monitor, you cannot start it again. If you want to be able to restart a Summary SQL Performance Monitor, you should pause the monitor instead of ending it.
To end an SQL performance monitor:
The SQL performance monitor ends and, in the case of the summary monitor, saves the data that it collected. You can now Analyze the results or, if you used a detailed performance monitor, Run a Visual Explain. You can also Delete your monitor from your system if you no longer need the data, freeing the resources that it uses.
Note: You need job control authority and read authority to the QUSRSYS schema to use the performance monitor.