create fn create in read-write mode the persistent hashtbl whose data are stored compressed in file fn and whose index is stored in fn ^ ".idx".

open_existing fn open in read-write mode the persistent hashtbl whose data are stored compressed in file fn and whose index is stored in fn ^ ".idx".

close db close the previously opened db.

sync db sync to disk the data and metadata (index) of db.

destroy db rm data and metadata files of db and clear db's index hashtbl.

mem db k check if k is bound in db.

add db k v add the key-value binding (k,v) to db. v is compressed on the fly.

replace db k v replace the current binding for k in db by a binding from k to v. v is compressed on the fly. Cf. Hashtbl.replace for details.

remove tbl k remove the current binding for k in db. Cf. Hashtbl.replace for details.

find db k get and uncompress the current binding of k in db or raise Not_found.

iter f db apply f to all key-value pairs in db. Values are uncompressed on the fly. Cf. Hashtbl.iter for details.

fold f db init fold f over all key-value pairs in db. Values are uncompressed on the fly. Cf. Hashtbl.fold for details.