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** Fixed at ArcGIS 8.2 **
Attempting to delete a geometric network that has recently had a trace performed on it in ArcMap returns:
"Failed to delete selected object(s)
Cannot acquire a schema lock because of an existing lock.
You attempted to open a database that is already opened exclusively by user 'username' on machine 'machinename'. Try again when the database is available."
This error still occurs even when a new document is opened in ArcMap.
The trace task you performed earlier is still holding a lock on the geometric network.
This problem has been addressed in ArcGIS Version 8.2.
If a previous version of ArcGIS is being used, close ArcMap before deleting a geometric network on which a trace was performed.