The main topics of this course are as follows: multi-user access to a DBMS (transactions, locking, transactions in SQL and a host language environment), physical implementation of a DBMS (data structures and algorithms applied in a DBMS) and query evaluation (query evaluation plans, optimization of the query evaluation). These topics will be presented for a DBMS like Oracle and SQL Server. The goal of this course is to provide extended informations about query evaluation. A student will use this knowledge during an implementation of a real information system.