Q.1
Which of the following is not one of the stages in the evolution of distributed DBMS?
Q.2
A homogenous distributed database is which of the following?
Q.3
Replication should be used when which of the following exist?
Q.4
Storing a separate copy of the database at multiple locations is which of the following?
Q.5
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.
Q.6

A distributed database is which of the following?

  • A single logical database that is spread to multiple locations and is interconnected by a network
  • A loose collection of file that is spread to multiple locations and is interconnected by a network
  • A single logical database that is limited to one location.
  • A loose collection of file that is limited to one location.
Q.7

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

  • Data Replication
  • Horizontal Partitioning
  • Vertical Partitioning
  • Horizontal and Vertical Partitioning
Q.8

A distributed database has which of the following advantages over a centralized database?

  • Software cost
  • Software complexity
  • Slow Response
  • Modular growth
Q.9

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

  • True
  • False
Q.10

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

  • True
  • False
Q.11

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

  • True
  • False
Q.12

A semijoin is which of the following?

  • Only the joining attributes are sent from one site to another and then all of the rows are returned.
  • All of the attributes are sent from one site to another and then only the required rows are returned.
  • Only the joining attributes are sent from one site to another and then only the required rows are returned.
  • All of the attributes are sent from one site to another and then only the required rows are returned.
Q.13

Which of the following is true concerning a global transaction?

  • The required data are at one local site and the distributed DBMS routes requests as necessary.
  • The required data are located in at least one nonlocal site and the distributed DBMS routes requests as necessary.
  • The required data are at one local site and the distributed DBMS passes the request to only the local DBMS.
  • The required data are located in at least one nonlocal site and the distributed DBMS passes the request to only the local DBMS.
Q.14

A homogenous distributed database is which of the following?

  • The same DBMS is used at each location and data are not distributed across all nodes.
  • The same DBMS is used at each location and data are distributed across all nodes.
  • A different DBMS is used at each location and data are not distributed across all nodes.
  • A different DBMS is used at each location and data are distributed across all nodes.
Q.15

An autonomous homogenous environment is which of the following?

  • The same DBMS is at each node and each DBMS works independently.
  • The same DBMS is at each node and a central DBMS coordinates database access.
  • A different DBMS is at each node and each DBMS works independently.
  • A different DBMS is at each node and a central DBMS coordinates database access.
Q.16

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

  • True
  • False
Q.17

The semijoin approach saves network traffic.

  • True
  • False
Q.18

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.

  • True
  • False
Q.19

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.

  • True
  • False
Q.20

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

  • True
  • False
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