Here is the fix for data collector purge job taking too long to complete. Please let us know if this fix solves your problem. Please send us your feedback to sethu.srinivasan@microsoft.com . I have also attached the query as attachment to this blog entry...

-- If you are not seeing random failures in following data collection job -- collection_set_1_noncached_collect_and_upload , please ignore this blog entry -- -- This script is to help our dev team understand the root cause of failed data collector job...