Hi all ! I need help in theory of Databases. I need to details about Data Dictionary.
My Questions are about Data Dictionary:
1. Role and Importance of Data Dictionary in DBMS structure ?
2. What are the various types contents available in the data dictionary?

My Second topic is Internet and Databases.
my Question is:
1.Role of databases in Internet
2.What are various tools available for managing databases in internet

Hoping for some Good answers and with tutorials.