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Distributed Databases Questions

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Which of the following is not one of the stages in the evolution of distributed DBMS?


AUnit of work

BRemote unit of work

CDistributed unit of Work

DDistributed request

Answer: Option A

Explanation:

Here is no explanation for this answer

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A distributed unit of work allows various statements within a unit of work to refer to multiple remote DBMS locations.


ATRUE

BFALSE

Answer: Option A

Explanation:

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Which of the following is a disadvantage of replication?


AReduced network traffic

BIf the database fails at one site, a copy can be located at another site.

CEach site must have the same storage capacity.

DEach transaction may proceed without coordination across the network.

Answer: Option C

Explanation:

Here is no explanation for this answer

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A transaction manager is which of the following?


AMaintains a log of transactions

BMaintains before and after database images

CMaintains appropriate concurrency control

DAll of the above.

Answer: Option D

Explanation:

Here is no explanation for this answer

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Asynchronous technology can result in unsatisfactorily slow response time because the distributed DBMS is spending considerable time checking that an update is accurately and completely propagated across the network.


ATRUE

BFALSE

Answer: Option B

Explanation:

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Which of the following is true concerning a global transaction?


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

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

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

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

Answer: Option B

Explanation:

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The purpose of timestamping is to avoid the use of locks.


ATRUE

BFALSE

Answer: Option A

Explanation:

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Some of the columns of a relation are at different sites is which of the following?


AData Replication

BHorizontal Partitioning

CVertical Partitioning

DHorizontal and Vertical Partitioning

Answer: Option C

Explanation:

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A distributed database is which of the following?


AA single logical database that is spread to multiple locations and is interconnected by a network

BA loose collection of file that is spread to multiple locations and is interconnected by a network

CA single logical database that is limited to one location.

DA loose collection of file that is limited to one location.

Answer: Option A

Explanation:

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An autonomous homogenous environment is which of the following?


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

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

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

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

Answer: Option A

Explanation:

Here is no explanation for this answer

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