I would not recommend fixing this for the client if you can get away with it, because it creates a 3-4hour performance hit on the server. An hour of this is 100% proc usage as well. The reason it breaks is because the server was rebooted during the stats update – 3AM – 5AM GMT.
To fix:
NOTE: This can only be run the day following the failure. That’s before midnight the following day. This is because it imports from yesterdays log file ONLY. If you run this tasks after midnight, it will not import the data you are looking for. Instead it will do the next day.
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