Exam 9: Database Management Approaches

A(n) ______________________________ is one in which data and the actions that operate on the data are encapsulated into objects.

A distributed database is a single logical database that is physically divided among computers at several sites on a network.

The formula for message transmission time is: communication time = access delay + (data volume / X),where X represents ____.

If users are unaware of fragmentation,the DDBMS has fragmentation transparency.

In objected-oriented DBMSs,the term class refers to the general structure of an object.

In an object-oriented DBMS,a(n) ____________________ is the set of values that are permitted for an attribute.

In objected-oriented DBMSs,the actions defined for a class are known as macros.

If the client,in a client/server system,performs the business functions (calculations,etc.),then this client is known as a(n) ____.

____ implies that the performance of functions such as adding sites,changing versions of DBMSs,creating backups,and modifying hardware should not require planned shutdowns of the entire distributed database.

Uncovering new knowledge,patterns,trends,and rules from the data stored in a data warehouse is known as ____.

When users are unaware of the steps taken by the DDBMS to update the various copies of data,this characteristic of the DDBMS is called ____.

____ is the data communication method used by Web clients and Web servers to exchange data on the Internet.

With ____________________ visibility,only the class itself or public or protected subclasses of the class can view or update the value in the attribute.

Explain the difference between a Web page,a Web server,and a Web client.

What are the advantages of distributed databases?

In a DDBMS,the site where the user is located is called the local site.

It is possible for local DBMSs to commit updates at some sites and undo updates at other sites. This inconsistency can be prevented by using a ____.

In an object-oriented DBMS,methods are defined during the ____________________ process.

In a three-tier client/server architecture,the clients perform the presentation functions,a database server performs the database functions,and separate computers called ____________________ perform the business functions and serve as an interface between clients and the database server.

Because the clients and the server perform different functions and can run two different operating systems,there is an arrangement of client/server architecture known as ____.