Here are listed some sources of information on DBMS that you may find useful:
Stanford self paced DB course
. It contains short videos that overview DBMS ideas that we will use during this course.
Tony Marston's
overview of DBMS ideas. It gives brief definitions of vocabulary and overviews some fundamental ideas.
Philip Greenspun's
overview of history and rationalization for DBMS.
A student thought the
Select Star SQL
site was very good.