The Art of SQL Server FILESTREAM - Red Gate Software

Chapter 7: FILESTREAM Database AdministrationCorruption caused by orphaned filesCreating or copying unwanted files in the FILESTREAM data container can also causecorruption in a database.Let us see what happens when an unwanted file is present in the FILESTREAM datacontainer. Go to the FILESTREAM data container and create a new file, or copy anexisting file from another folder. For this demonstration, I copied the MicrosoftMouse.jpg into the FILESTREAM data container's folder structure. Then, run DBCC CHECKDB orDBCC CHECKTABLE and you should see an error message similar to the following:Table error: The file "\12f4b92b-6c51-43a5-9a32-71d1b0de0646\MicrosoftMouse.jpg" in therowset directory ID 4443b7d5-904c-475d-bcc8-20bc0e09b887 is not a valid FILESTREAM file.Note that SQL Server complains that there is a file present that is not a validFILESTREAM file. One could probably argue that this is because the file is not correctlynamed. Files in the FILESTREAM data folder do not have extensions, and they are namedfollowing a certain pattern. Go back to your FILESTREAM folder and rename the file sothat it follows the same naming pattern as the other files in the FILESTREAM folder, andthen run DBCC CHECKTABLE again.Table error: The orphaned file "0000001b-0000015c-0005" was found in the FILESTREAM directoryID 12f4b92b-6c51-43a5-9a32-71d1b0de0646 for object ID 21575115, index ID 0, partition ID72057594039042048, column ID 4.Note that the error is different now. This time, SQL Server detected that there is anorphan file in the FILESTREAM directory. Let's see if DBCC CHECKDB can fix this bydeleting the orphaned file; rerun DBCC CHECKDB with repair_allow_data_loss(Listing 7-16).Table error: The orphaned file "0000001b-0000015c-0005" was found in the FILESTREAM directoryID 12f4b92b-6c51-43a5-9a32-71d1b0de0646 for object ID 21575115, index ID 0, partition ID72057594039042048, column ID 4.291