Other Useful Texts
Database Management Systems (Ramakrishnan)
Foundations of Databases (Abiteboul, Hull & Vianu)
Parallel and Distributed DBMS (Ozsu and Valduriez)
Transaction Processing (Gray and Reuter)
Database Systems (Silberschatz, Korth and Sudarshan)
Data and Knowledge based Systems (volumes I, II) (Ullman)
Readings in Database Systems (Stonebraker and Hellerstein)
Proceedings of SIGMOD, VLDB, PODS conferences.