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Database
Distributed Databases
Quiz 1
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Q.1
Data replication is favored where most process requests are read-only and where the data are relatively static.
True
False
Q.2
The cost to perform a snapshot refresh may depend on whether the snapshot is simple or complex.
True
False
Q.3
The semijoin approach saves network traffic.
True
False
Q.4
In a semijoin, only the joining attribute is sent from one site to another, and then only the required rows are returned.
True
False
Q.5
The problem of concurrency control is more complex in a distributed database.
True
False
Q.6
Databases that are stored on computers at multiple locations and are not interconnected by a network are known as distributed databases.
True
False
Q.7
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.8
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.9
A distributed unit of work allows various statements within a unit of work to refer to multiple remote DBMS locations.
True
False
Q.10
The purpose of timestamping is to avoid the use of locks.
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
Each site (or node) in a distributed system is subject to the same types of failure as in a centralized system.
True
False
Q.13
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.14
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.15
Which of the following is a disadvantage of replication?
Reduced network traffic
If the database fails at one site, a copy can be located at another site.
Each site must have the same storage capacity.
Each transaction may proceed without coordination across the network.
Q.16
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.17
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.18
Replication may use either synchronous or asynchronous distributed database technologies, although asynchronous technologies are more typical in a replicated environment.
True
False
Q.19
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.
True
False
Q.20
A distributed database can use which of the following strategies?
Totally centralized at one location and accessed by many sites
Partially or totally replicated across sites
Partitioned into segments at different sites
All of the above
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