8457318
Descripción
Test por Miguel Lucero, actualizado hace más de 1 año
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Creado por Miguel Lucero
hace alrededor de 7 años
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Pregunta 1
Pregunta
1. A distributed database management system (DDBMS) governs the storage and processing of logically related data over interconnected computer systems.
Respuesta
- True
- False
Pregunta 2
Pregunta
2. Distributed data access was needed to support geographically dispersed business units.
Respuesta
- True
- False
Pregunta 3
Pregunta
3. Rapid ad hoc data became unnecessary in the quick-response decision-making environment.
Respuesta
- True
- False
Pregunta 4
Pregunta
4. The Internet is the repository for distributed data.
Respuesta
- True
- False
Pregunta 5
Pregunta
5. Current distributed database management system (DDBMS) are subject to some problems, such as the complexity of management and control
Respuesta
- True
- False
Pregunta 6
Pregunta
6. Distributed processing shares a database's logical processing among two or more physically independent sites that are connected through a network.
Respuesta
- True
- False
Pregunta 7
Pregunta
7. One of the advantages of a distributed database management system (DDBMS) is that the data is located near the site with the least demand.
Respuesta
- True
- False
Pregunta 8
Pregunta
8. One of the advantages of a distributed database management system (DDBMS) is growth facilitation.
Respuesta
- True
- False
Pregunta 9
Pregunta
9. One of the advantages of a distributed database management system (DDBMS) is security.
Respuesta
- True
- False
Pregunta 10
Pregunta
10. Distributed processing does not require a distributed database, and a distributed database does not require distributed processing.
Respuesta
- True
- False
Pregunta 11
Pregunta
11. In order to manage distributed data, copies or parts of the database processing functions must be distributed to all data storage sites.
Respuesta
- True
- False
Pregunta 12
Pregunta
12. A database management system (DBMS) must have validation, transformation, and mapping functions, as well as other functions, in order to be classified as distributed.
Respuesta
- True
- False
Pregunta 13
Pregunta
13. A fully distributed database management system (DBMS) must perform all the functions of a centralized DBMS, and it must handle all necessary functions imposed by the distribution of data and processing.
Respuesta
- True
- False
Pregunta 14
Pregunta
14. The transaction processor (TP) is the software component found in each computer that requests data.
Respuesta
- True
- False
Pregunta 15
Pregunta
15. A distributed database management system (DDBMS) must be communications-media-dependent.
Respuesta
- True
- False
Pregunta 16
Pregunta
16. A transaction processor (TP) is the software component residing on each computer that stores and retrieves data located at the site.
Respuesta
- True
- False
Pregunta 17
Pregunta
17. In the single-site processing, single-site data (SPSD) scenario, all processing must be done on the end user's side of the system.
Respuesta
- True
- False
Pregunta 18
Pregunta
18. Performance transparency ensures that the system finds the most cost-effective path to access remote data.
Respuesta
- True
- False
Pregunta 19
Pregunta
The level of transparency supported by the distributed database management system remains the same for all systems.
Respuesta
- True
- False
Pregunta 20
Pregunta
20. Distribution transparency is supported by a distributed data dictionary.
Respuesta
- True
- False
Pregunta 21
Pregunta
21. Distributed database systems do not require complex mechanisms to manage transactions and ensure the database's consistency and integrity.
Respuesta
- True
- False
Pregunta 22
Pregunta
22. A remote transaction, composed of several requests, may access data at multiple sites.
Respuesta
- True
- False
Pregunta 23
Pregunta
23. A centralized database management is subject to a problem such as____________
Respuesta
-
a. a growing number of remote locations
-
b. maintaining and operating small database systems
-
c. dependence on multiple sites
-
d. organizational flexibility of the database
Pregunta 24
Pregunta
24. A disadvantage of a distributed database management system (DDBMS) is that:
Respuesta
-
a. it is slower in terms of data access.
-
b. adding new sites affects other sites' operations.
-
c. it is processor dependent.
-
d. there are lack of standards.
Pregunta 25
Pregunta
25. A distributed database is composed of several parts known as database .
Respuesta
-
a. sections
-
b. fragments
-
c. partitions
-
d. parts
Pregunta 26
Pregunta
26. Distributed processing does not require
Respuesta
-
a. database processing functions to be distributed to all data storage sites.
-
b. an existing distributed database.
-
c. a network of interconnected components.
-
d. multiple sites to share processing chores.
Pregunta 27
Pregunta
27. A database management system needs to prepare the data for presentation to the end user or to an application program.
Respuesta
-
a. security
-
b. concurrency control
-
c. formatting
-
d. I/O interface
Pregunta 28
Pregunta
28. The processor is the software component found in each computer that requests data. It receives and processes the application's data requests.
Respuesta
-
a. database
-
b. transaction
-
c. data
-
d. network
Pregunta 29
Pregunta
29. In theory, a(n) can be an independent centralized database management system with proper interfaces to support remote access from other independent database management systems in the network.
Respuesta
-
a. transaction processor
-
b. application processor
-
c. transaction manager
-
d. data processor
Pregunta 30
Pregunta
30. Under the scenario, all record- and file-locking activities are performed at the end-user location.
Respuesta
-
a. single-site processing, single-site data
-
b. multiple-site processing, single-site data
-
c. single-site processing, multiple-site data
-
d. multiple-site processing, multiple-site data
Pregunta 31
Pregunta
31. _____ distributed database management system (DDBMS) integrate multiple instances of the same DBMS over a network.
Respuesta
-
a. Homogeneous
-
b. Heterogeneous
-
c. Fully heterogeneous
-
d. Combination
Pregunta 32
Pregunta
32. A distributed database system will support different database management systems (DBMS) that may even support different models running under different computer systems.
Respuesta
-
a. fully heterogeneous
-
b. fully homogeneous
-
c. homogeneous
-
d. heterogeneous
Pregunta 33
Pregunta
33. A DDBMS is subject to which of the following restrictions?
Respuesta
-
a. Multiple instances of the same database should be integrated over a network.
-
b. All database processing must be done at a single site.
-
c. Rapid ad hoc data access is not possible.
-
d. Remote data access is provided on a read-only basis.
Pregunta 34
Pregunta
34. transparency allows a physically dispersed database to be managed as though it were centralized.
Respuesta
-
a. Distribution
-
b. Transaction
-
c. Failure
-
d. Performance
Pregunta 35
Pregunta
35. transparency allows data to be updated simultaneously at several network sites.
Respuesta
-
a. Transaction
-
b. Distribution
-
c. Failure
-
d. Performance
Pregunta 36
Pregunta
36. transparency allows the system to operate as if it were a centralized database management system.
Respuesta
-
a. Heterogeneity
-
b. Distribution
-
c. Performance
-
d. Failure
Pregunta 37
Pregunta
transparency is the highest level of transparency. The end user or programmer does not need to know that a database is partitioned.
Respuesta
-
a. Performance
-
b. Fragmentation
-
c. Location
-
d. Local mapping
Pregunta 38
Pregunta
38. transparency exists when the end user or programmer must specify the database fragment names but does not need to specify where these fragments are located.
Respuesta
-
a. Transaction
-
b. Location
-
c. Local mapping
-
d. Fragmentation
Pregunta 39
Pregunta
39. A contains the description of the entire database as seen by the database administrator.
Respuesta
-
a. distributed global dictionary
-
b. distributed data dictionary
-
c. distributed global schema
-
d. distributed data schema
Pregunta 40
Pregunta
40. A lets a single SQL statement access the data that are to be processed by a single remote database processor.
Respuesta
-
a. remote request
-
b. remote transaction
-
c. distributed request
-
d. distributed transaction
Pregunta 41
Pregunta
41. A distributed can reference several different local or remote data processing sites.
Respuesta
-
a. request
-
b. site
-
c. data location
-
d. transaction
Pregunta 42
Pregunta
42. A request lets a single SQL statement reference data located at several different local or remote DP sites.
Respuesta
-
a. distributed
-
b. transaction
-
c. fragmented
-
d. remote
Pregunta 43
Pregunta
43. 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.
Respuesta
-
a. DO-UNDO-REDO protocol
-
b. two-phase commit protocol (2PC)
-
c. coordinator protocol
-
d. write-ahead protocol
Pregunta 44
Pregunta
44. The objective of optimization is to minimize the total cost associated with the execution of a request.
Respuesta
-
a. data
-
b. remote
-
c. transaction
-
d. query
Pregunta 45
Pregunta
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.
Respuesta
-
a. Data distribution
-
b. Replica transparency
-
c. Network latency
-
d. Network partitioning
Pregunta 46
Pregunta
fragmentation allows a user to break a single object into two or more segments, or fragments.
Respuesta
-
a. Horizontal
-
b. Vertical
-
c. Data
-
d. Request
Pregunta 47
Pregunta
47. fragmentation refers to the division of a relation into subsets of tuples.
Respuesta
-
a. Vertical
-
b. Horizontal
-
c. Data
-
d. Mixed
Pregunta 48
Pregunta
fragmentation refers to the division of a relation into attribute subsets.
Respuesta
-
a. Data
-
b. Horizontal
-
c. Vertical
-
d. Mixed
Pregunta 49
Pregunta
49. The rule requires that all copies of data fragments be identical.
Respuesta
-
a. shared fragment
-
b. mutual consistency
-
horizontal fragmentation
-
d. replication
Pregunta 50
Pregunta
50. A(n) database stores each database fragment at a single site.
Respuesta
-
a. partially replicated
-
b. unreplicated
-
c. fully replicated
-
d. partitioned
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