All of the following are true when there is targeted data replication on a distributed database network, except ____.
A) there is no need for distributed joins because one site must have a copy of the entire database
B) a two-phase commit is necessary if all of the replicated copies of a table must be kept up-to-date all of the time
C) there is improved availability because of the data replication
D) communications costs for read-only data access are reduced because copies of tables can be located at multiple sites that most heavily use them
E) it requires a distributed directory

Question

Quizplus · Accepted Answer

Targeted data replication means that each site only has a subset of the entire database, not the entire database itself. Therefore, distributed joins may still be necessary if data needs to be accessed from multiple sites. The rest of the options are true for targeted data replication.

All of the Following Are True When There Is Targeted