persistency:db

Use File as persistent database for the calling module. The calling module must defined persistent/1 to declare the database terms. Defined options:

sync(+Sync): One of 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.

If the file ends in an incomplete term, e.g., because the disk was full or the process was killed while writing, a warning is printed and the file is truncated to just after the last complete term.