This is a reasonably well known problem on NT. Generally the error is seen when a routine NT file system backup takes a byte-range lock on one of the Oracle datafiles in that file system in order to back it up. There are many solutions, such as configuring the backup software to skip open files, or at least not to lock them; or you can use ocopy to copy the datafiles and back those up instead; or you can shutdown the instance; and so on. [@more@]
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