Exam 9: Database Management Approaches

Accessing data using messages over a network is substantially faster than accessing data on a disk.

When one class is a subclass of a second class, you call the second class a ____________________ of the first class.

On a class diagram, a(n) ____________________ symbol precedes each attribute.

It is possible for local DBMSs to commit updates at some sites and undo updates at other sites. How can this inconsistency be prevented?

Discuss the differences between how client-side extensions and server-side extensions are created and executed, including the kinds of languages used to create them.

Which type of DDBMS has at least two sites at which the local DBMS are different?

The use of a three-tier architecture can help solve the scalability problem of the two-tier architecture.

When users access a data warehouse, their queries usually involve aggregate data. What type of software is used to perform these queries?

Which rule for distributed databases states that users should feel as if the entire database is stored locally?

A(n) ____________________ DDBMS is a database that has the same local DBMS at each site.

What are the advantages of a client/server system?

On a class diagram, the lines joining the classes represent the relationships and are called ____________________.

The relationship between a superclass and a subclass is called a ____________________.

To execute the steps in a(n) ____________________, the user sends a message to the object.

The term domain refers to the general structure of an object.

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

A DDBMS is a DBMS capable of supporting and manipulating ____________________ databases.

A local deadlock involves one transaction that requires a record held by a second transaction at one site, while the second transaction requires a record held by the first transaction at a different site.

When you use thin clients in a two-tier architecture, you have a potential client maintenance problem.

The beginning of a URL specifies the data communication method used by clients and servers to exchange data on the Internet.