Suggested removal order
Results are still dependent upon Oracle XE and the performance of the system, but these instructions provide the greatest success rate.
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Delete the devices. Confirm they have been removed. If you have a Web UI timeout, then wait a few minutes. This can take in excess of 15 minutes to complete.
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Delete the data-collector.
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Delete the group.
If the issue persists, search for more information related to this issue or contact support for further assistance.