You can create a DataLink column with different link
controls.
These different control levels are:
NO LINK CONTROL
When a column is created as NO LINK CONTROL level, there is no linking that takes place when rows are added to the SQL table. The URL is verified to be syntactically correct, but there is no check to make sure that the server is accessible, or that the file even exists.
FILE LINK CONTROL with FS permissions
When the DataLink column is created as FILE LINK CONTROL level with file system (FS) permissions, the system will verify that any DataLink value is a valid URL, with a valid server name and file name.
FILE LINK CONTROL with DB permissions
When the DataLink column is create as FILE LINK CONTROL with database (DB) permissions, the URL is verified, and all existing permissions to the object are removed.