chapter 7...

1.Describe two primary method of integrating information across multiple database?
   The primary method integrating information across multiple database is a forward integration takes information entered into a given system and sends it automatically to all downstream systems and process.Secondly,a backward integration takes information to all downstream systems and process.
 
2.Describe the benefit of data-driven web site ?

-The benefits of data driven web site is to allow the website owner to make changes any time,a status website requires a programmer to make updates.It useful to when site offers a great deal of information,products,or services.A static website requires a programmer to make updates.This adds an unnecessary layer between the business and its web content,which can lead to misunderstandings and slow turn a round and desired changes.

 3.Define the fundamental concept of the rational database model?

-fundamental concept of rational database model have two types firstly entities and attributes.Entities in the rational database model is the person ,place,thing,transaction or event about which information is stored.Attributes also called fields or columns are characteristic or properties of an entity class.Secondly keys and relationships.

4.Evaluate the advantages of the rational database model?

-Firstly increase flexibility.increased scalability and performance. It database tend to mirror bushiness structures  ad good database can handle changes quickly and easily.It reduced information redundancy.Redundancy is the duplication of information,or storing the same information in multiple places.Besides that, increased information integrity(quality) and increased information security.


http://www.teach-ict.com/as_as_computing/ocr/H447/F453/3_3_9/database_design/miniweb/pg8.htm

5.Compare operational integrity constraints and business-critical integrity constraints?

-Operational integrity constraints are rules that enforce basic and fundamental information-based  constraints and Business-critical integrity constraints are rules that enforce rules vital to an organization success and often require more insight and knowledge than operational integrity constraints.


http://docs.oracle.com/cd/B28359_01/server.111/b28313/constra.htm