"Over 70% of web applications use a database to store persistent data. What are some of the problems and issues associated with internet databases?

"Over 70% of web applications use a database to store persistent data. What are some of the problems and issues associated with internet databases? Consider security, performance, architecture issues, and whatever else is relevant with regard to the database.

All over the world the people are going application savvy and they are going more and moreweb applications that store the crucial information and the user is having many problems thatcan arise....