Exam 12: Distributed Database Management Systems

Typically,the scenario requires a network file server running conventional applications that are accessed through a network.

The fragment condition indicates that no row has a duplicate,regardless of the fragment in which it is located.

The transaction processor (TP)is the software component found in each computer that requests data.

The Internet is the repository for distributed data.

The forces the log entry to be written to permanent storage before the actual operation takes place.

is the delay imposed by the amount of time required for a data packet to make a round trip from point A to point B.

Explain the difference between homogeneous and heterogeneous distributed database management systems (DDBMS).

In a distributed database management system (DDBMS),query is used to find the best access strategy.

A transaction processor (TP)is the software component residing on each computer that stores and retrieves data located at the site.

Describe performance transparency and heterogeneity transparency.

The level of transparency supported by the distributed database management system remains the same for all systems.

The distributed database system must be of the computer hardware system.

A disadvantage of a distributed database management system (DDBMS)is that:

One of the advantages of a distributed database management system (DDBMS)is processor .

A distributed database is composed of several parts known as database .

A DDBMS is subject to which of the following restrictions?

Describe any five of the 12 commandments formulated by C.J.Date for distributed databases.

The guarantees that if a portion of a transaction operation cannot be committed,all changes made at the other sites participating in the transaction will be undone to maintain a consistent database state.

A(n)database stores each database fragment at a single site.

Distributed data access was needed to support geographically dispersed business units.