, systems
            supporting the IEEE/ANSI Std 1003.1 (POSIX) standard O_DSYNC flag,
            or systems supporting the Windows FILE_FLAG_WRITE_THROUGH flag).
            This flag may result in inaccurate file modification times and other
            file-level information for Berkeley DB database files. This flag
            will almost certainly result in a performance decrease on most
            systems. This flag is only applicable to certain filesysystems (for
            example, the Veritas 