DISTRIBUTED DATABASES QUIZ

All of these

Maintains before and after database images

Maintains appropriate concurrency control

Maintains a log of transactions

True

False

Partially or totally replicated across sites

Partitioned into segments at different sites

All of these

Totally centralized at one location and accessed by many sites

True

False

The required data are at one local site and the distributed DBMS routes requests as necessary.

The required data are located in at least one nonlocal site and the distributed DBMS routes requests as necessary.

The required data are at one local site and the distributed DBMS passes the request to only the local DBMS.

The required data are located in at least one nonlocal site and the distributed DBMS passes the request to only the local DBMS.

True

False

Remote unit of work

Distributed unit of Work

Unit of work

Distributed request

True

False

Vertical Partitioning

Horizontal and Vertical Partitioning

Data Replication

Horizontal Partitioning

A different DBMS is at each node and each DBMS works independently.

A different DBMS is at each node and a central DBMS coordinates database access.

The same DBMS is at each node and a central DBMS coordinates database access.

The same DBMS is at each node and each DBMS works independently.