Concurrent Administrative operations

Have you ever wondered which administrative tasks on a database can be performed concurrently? Below is a simple schema where the black dot indicates that those two tasks cannot run simultaneously.

File shrink operations spend most processing time reallocating pages into areas retained after the shrink has completed; it then attempts to change the file size only as the last step. File shrink operations can be started while a backup is running, provided that the backup finishes before the file shrink operation attempts to change the size of the files.

Reference: http://msdn.microsoft.com/en-us/library/ms189315(v=SQL.90).aspx

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