MCQ Exam Test

Q1

A heterogeneous distributed database is which of the following?

A The same DBMS is used at each location and data are not distributed across all nodes.
B The same DBMS is used at each location and data are distributed across all nodes.
C A different DBMS is used at each location and data are not distributed across all nodes.
D A different DBMS is used at each location and data are distributed across all nodes.

Q2

A distributed database is which of the following?

A A single logical database that is spread to multiple locations and is interconnected by a network
B A loose collection of file that is spread to multiple locations and is interconnected by a network
C A single logical database that is limited to one location.
D A loose collection of file that is limited to one location.

Q3

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

Q4

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

A Unit of work
B Remote unit of work
C Distributed unit of Work
D Distributed request

Q5

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

Q6

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

A True
B False

Q7

Which of the following is a disadvantage of replication?

A Reduced network traffic
B If the database fails at one site, a copy can be located at another site.
C Each site must have the same storage capacity.
D Each transaction may proceed without coordination across the network.

Q8

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

A True
B False

Q9

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

Q10

Replication should be used when which of the following exist?

A When transmission speeds and capacity in a network prohibit frequent refreshing of large tables.
B When using many nodes with different operating systems and DBMSs and database designs.
C The application's data can be somewhat out-of-date.
D All of the above.

Q11

A distributed database can use which of the following strategies?

A Totally centralized at one location and accessed by many sites
B Partially or totally replicated across sites
C Partitioned into segments at different sites
D All of the above

Q12

A homogenous distributed database is which of the following?

A The same DBMS is used at each location and data are not distributed across all nodes.
B The same DBMS is used at each location and data are distributed across all nodes.
C A different DBMS is used at each location and data are not distributed across all nodes.
D A different DBMS is used at each location and data are distributed across all nodes.

Q13

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

A True
B False

Q14

Which of the following is true concerning a global transaction?

A The required data are at one local site and the distributed DBMS routes requests as necessary.
B The required data are located in at least one nonlocal site and the distributed DBMS routes requests as necessary.
C The required data are at one local site and the distributed DBMS passes the request to only the local DBMS.
D The required data are located in at least one nonlocal site and the distributed DBMS passes the request to only the local DBMS.

Q15

Storing a separate copy of the database at multiple locations is which of the following?

A Data Replication
B Horizontal Partitioning
C Vertical Partitioning
D Horizontal and Vertical Partitioning

Q16

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

Q17

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

A True
B False

Q18

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

A True
B False

Q19

The semijoin approach saves network traffic.

A True
B False

Q20

A semijoin is which of the following?

A Only the joining attributes are sent from one site to another and then all of the rows are returned.
B All of the attributes are sent from one site to another and then only the required rows are returned.
C Only the joining attributes are sent from one site to another and then only the required rows are returned.
D None of the above

Q21

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

Q22

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

Q23

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

A True
B False

Q24

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

A True
B False

Q25

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

A Data Replication
B Horizontal Partitioning
C Vertical Partitioning
D Horizontal and Vertical Partitioning

dbms - Part 24

A heterogeneous distributed database is which of the following?

A distributed database is which of the following?

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

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

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

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

Which of the following is a disadvantage of replication?

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

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.

Replication should be used when which of the following exist?

A distributed database can use which of the following strategies?

A homogenous distributed database is which of the following?

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

Which of the following is true concerning a global transaction?

Storing a separate copy of the database at multiple locations is which of the following?

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.

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

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

The semijoin approach saves network traffic.

A semijoin is which of the following?

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.

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.

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

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

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

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