Using the new WideWorldImporters database as an example; this database contains one primary file (WWI_Primary) and one secondary (WWI_UserData) each within their own filegroup (PRIMARY and USERDATA respectively). I have a full, a T-Log and a file backup of JUST the secondary file, which all went just fine, but if I attempt to restore ONLY the secondary file (with no recovery so I can apply the log backup) it tells me the primary file does not exist in the backup, and that it must be restored first... and the restore terminates. Ummm... forgive my logic but if the primary file has to be restored first what's the point of being able to do a secondary file backup? It's in essence telling me that I have to do a full restore from a full backup. I don't need the primary file to be restored as it's perfectly fine. Isn't that the point of a file restore? To nothave to restore the entire database??
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