Solution : https://service.sap.com/sap/support/notes/601186 (SAP Service marketplace login required)
Key words :
exclusive locks inthe system, symptom sm66 takes, calling sm66, report runnig, long antiming, support package, prerequisites
Related Notes :
| 135587 | SM66 hangs / takes very long / results in time out |
| 126676 | Performance problems when displaying locks |