A semijoin is which of the following?
A. Only the joining attributes are sent from one site to another and then all of the rows are returned.
B. All of the attributes are sent from one site to another and then only the required rows are returned.
C. Only the joining attributes are sent from one site to another and then only the required rows are returned.
D. All of the attributes are sent from one site to another and then only the required rows are returned.
Answer: Option C
This Question Belongs to Database >> Distributed Databases
A distributed database has which of the following advantages over a centralized database?
A. Software cost
B. Software complexity
C. Slow Response
D. Modular growth
An autonomous homogenous environment is which of the following?
A. The same DBMS is at each node and each DBMS works independently.
B. The same DBMS is at each node and a central DBMS coordinates database access.
C. A different DBMS is at each node and each DBMS works independently.
D. A different DBMS is at each node and a central DBMS coordinates database access.
A transaction manager is which of the following?
A. Maintains a log of transactions
B. Maintains before and after database images
C. Maintains appropriate concurrency control
D. All of the above
Location transparency allows for which of the following?
A. Users to treat the data as if it is at one location
B. Programmers to treat the data as if it is at one location
C. Managers to treat the data as if it is at one location
D. All of the above
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