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Distributed Databases Questions

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Choose the correct option.

Replication may use either synchronous or asynchronous distributed database technologies, although asynchronous technologies are more typical in a replicated environment.


ATRUE

BFALSE

Answer: Option A

Explanation:

Here is no explanation for this answer

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A distributed database can use which of the following strategies?


ATotally centralized at one location and accessed by many sites

BPartially or totally replicated across sites

CPartitioned into segments at different sites

DAll of the above

Answer: Option D

Explanation:

Here is no explanation for this answer

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A heterogeneous distributed database is which of the following?


AThe same DBMS is used at each location and data are not distributed across all nodes.

BThe same DBMS is used at each location and data are distributed across all nodes. .

CA different DBMS is used at each location and data are not distributed across all nodes.

DA different DBMS is used at each location and data are distributed across all nodes

Answer: Option D

Explanation:

Here is no explanation for this answer

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Synchronization for pull replication is less disruptive and occurs only when needed by each site, not when a central master site thinks it is best to update.


ATRUE

BFALSE

Answer: Option A

Explanation:

Here is no explanation for this answer

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A homogenous distributed database is which of the following?


AThe same DBMS is used at each location and data are not distributed across all nodes.

BThe same DBMS is used at each location and data are distributed across all nodes.

CA different DBMS is used at each location and data are not distributed across all nodes.

DA different DBMS is used at each location and data are distributed across all nodes.

Answer: Option B

Explanation:

Here is no explanation for this answer

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An increasingly popular option for data distribution as well as for fault tolerance of any database is to store a separate copy of the database at each of two or more sites.


ATRUE

BFALSE

Answer: Option A

Explanation:

Here is no explanation for this answer

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A semijoin is which of the following?


AOnly the joining attributes are sent from one site to another and then all of the rows are returned.

BAll of the attributes are sent from one site to another and then only the required rows are returned.

COnly the joining attributes are sent from one site to another and then only the required rows are returned.

DAll of the attributes are sent from one site to another and then only the required rows are returned.

Answer: Option C

Explanation:

Here is no explanation for this answer

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With failure transparency, all of the actions of a transaction are committed or none of them are committed.


ATRUE

BFALSE

Answer: Option A

Explanation:

Here is no explanation for this answer

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Each site (or node) in a distributed system is subject to the same types of failure as in a centralized system.


ATRUE

BFALSE

Answer: Option A

Explanation:

Here is no explanation for this answer

Workspace

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