The Art of SQL Server FILESTREAM - Red Gate Software

Chapter 11: FileTableColumn Nameis_offlineis_hiddenis_readonlyis_archiveis_systemis_temporaryColumn DescriptionReflects the NTFS extended file attribute "offline."When this attribute is set, it means that the file is onlyavailable when working online. This attribute is bestleft unmodified.Reflects the hidden attribute of the file system.Reflects the read-only attribute of the file system.Reflects the archive attribute of the file system.Usually, the archive bit is reset by full and incrementalbackup operations and set by the Windows APIs whenthe file contents are changed.It's important to note that when modifying thefile_stream value using T-SQL, the archive bit isnot set automatically by SQL Server.Reflects the system file attribute of the file system.Reflects the NTFS extended file attribute "temporary."SampleValue(s)Table 11-1:Overview of the FileTable schema.You'll notice that the majority of the columns in the schema are metadata columns. Ina traditional file system, this metadata would be stored in the file system's metadataarea (like the MFT for NTFS). This metadata is used by the SQL Server component thatexposes the FileTable's contents as a file share to set the file and folder attributes. Theydo not influence how the files can be used. For example, if the is_readonly bit is setto 1, it does not mean that SQL Server will enforce that the file contents cannot bechanged. These metadata attributes are only present to provide compatibility with theNTFS file system.391