You can start getting into a gray area here as to exactly what is causing this error. Most likely it is something that made the query execute outside the bounds of the normal connection timeout period. The question is was this caused by slow SQL performance or by a network issue? If you have the time you could do this upgrade again and see if you get the same error message at the same place. You could also perform some SQL maintenance, using DBCC commands, to insure your tables and indexes are physically healthy and then do the upgrade again. DBCC CHECKDB(Database Name) DBCC CHECKCATALOG(Database Name)
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