DBMS interfaces
Things you connect to.
MySQL
PostgreSQL
Oracle
Sybase
MSSQL
BerkeleyDb
Datafiles interfaces
Things you open.
xBase
Which stands for .dbf files interface.BR .bdf files were produced by several old systems like dBase(II,III,IV), Fox(Base,Pro)
dbm
A family of old unix plain hash tables. Has varieties like dbm, ndbm, gdbm, dbmdb185.BR See [http://www.python.org/doc/current/lib/module-anydbm.html anydbm], [http://www.python.org/doc/current/lib/module-dumbdbm.html dumbdbm], [http://www.python.org/doc/current/lib/module-dbhash.html dbhash], [http://www.python.org/doc/current/lib/module-bsddb.html bsddb], [http://www.python.org/doc/current/lib/module-dbm.html dbm], [http://www.python.org/doc/current/lib/module-gdbm.html gdbm] in Python Standard Library.