| current_persistent_predicate/1 | True 
if PI is a predicate that provides access to the persistent database DB. | 
| db_assert/1 | Assert 
Term into the database and record it for persistency. | 
| db_attach/2 | Use 
File as persistent database for the calling module. | 
| db_attached/1 | True 
if the context module attached to the persistent database File. | 
| db_detach/0 | Detach 
persistency from the calling module and delete all persistent clauses 
from the Prolog database. | 
| db_retract/1 | Retract 
terms from the database one-by-one. | 
| db_retractall/1 | Retract 
all matching facts and do the same in the database. | 
| db_sync/1 | Synchronise 
database with the associated file. | 
| db_sync_all/1 | Sync 
all registered databases. | 
| persistent/1 | Declare 
dynamic database terms. |