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Distributed Databases MCQs

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Distributed Databases MCQs

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The problem of concurrency control is more complex in a distributed database.

A. True
B. False

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In a semijoin, only the joining attribute is sent from one site to another, and then only the required rows are returned.

A. True
B. False

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The semijoin approach saves network traffic.

A. True
B. False

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The cost to perform a snapshot refresh may depend on whether the snapshot is simple or complex.

A. True
B. False

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Data replication is favored where most process requests are read-only and where the data are relatively static.

A. True
B. False

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

A. True
B. False

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

A. True
B. False

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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.

A. True
B. False

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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.

A. True
B. False

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Databases that are stored on computers at multiple locations and are not interconnected by a network are known as distributed databases.

A. True
B. False

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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.

A. True
B. False

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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.

A. True
B. False

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Distributed Databases MCQs

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Distributed Databases MCQs

The problem of concurrency control is more complex in a distributed database.

In a semijoin, only the joining attribute is sent from one site to another, and then only the required rows are returned.

The semijoin approach saves network traffic.

The cost to perform a snapshot refresh may depend on whether the snapshot is simple or complex.

Data replication is favored where most process requests are read-only and where the data are relatively static.

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

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

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.

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.

Databases that are stored on computers at multiple locations and are not interconnected by a network are known as distributed databases.

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.

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.