I had an odd issue recently that I thought I should share. We copied the Live db to a test instance and the Live system CPU went to 100%!
When we copy Live to Test we have a PowerShell script to do the process. The script makes some updates on the way through (disables some BPM’s, changes company name etc). We have started preparing for an upgrade to 10.2.700 recently so I spun up a new instance and copied the Live database over manually. Shortly after starting up the task agent on the upgrade test instance the CPU on the Live instance went to 100%. Took me a while to track it down but it was caused by the multicompany direct process on the upgrade test system interfering with the Live system. Turns out one of the things the PowerShell script was doing was to change the system agent parameters for the AppServer URL and data directories to the test server. When I copied the db manaully I didnt do this so when the Multi Company Direct process kicked in the Live server fell to its knees.
Hoping this will help someone someday avoid the same mistake 
Brett
