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- Question
The cost to perform a snapshot refresh may depend on whether the snapshot is simple or complex.
Options- A. True
- B. False
- Correct Answer
- True
- 1. Replication may use either synchronous or asynchronous distributed database technologies, although asynchronous technologies are more typical in a replicated environment.
Options- A. True
- B. False Discuss
- 2. The semijoin approach saves network traffic.
Options- A. True
- B. False Discuss
- 3. With asynchronous technology, if any copy of a data item is updated anywhere on the network, the same update is immediately applied to all other copies or it is aborted.
Options- A. True
- B. False Discuss
- 4. Data replication is favored where most process requests are read-only and where the data are relatively static.
Options- A. True
- B. False Discuss
- 5. With failure transparency, all of the actions of a transaction are committed or none of them are committed.
Options- A. True
- B. False Discuss
- 6. Each site (or node) in a distributed system is subject to the same types of failure as in a centralized system.
Options- A. True
- B. False Discuss
- 7. If you know all the possible values that an attribute can have, you can enumerate those values in ODL.
Options- A. True
- B. False Discuss
- 8. The ODMG Object Model supports only unary and binary relationships.
Options- A. True
- B. False Discuss
- 9. Before specifying a key for a class, you must specify its extent.
Options- A. True
- B. False Discuss
- 10. In ODL, you specify an operation using parentheses after its name.
Options- A. True
- B. False Discuss
Distributed Databases problems
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