db_attach(:File, 
+Options)- sync(+Sync)
 - One of 
close(close journal after write),flush(default, flush journal after write) ornone(handle as fully buffered stream). 
If File is already attached this operation may change the sync 
behaviour.
db_attach(:File, 
+Options)close (close journal after write), flush 
(default, flush journal after write) or none (handle as 
fully buffered stream).
If File is already attached this operation may change the sync 
behaviour.