Deck 12: Distributed Database Management Systems

Question 1

A distributed database management system (DDBMS)must be communications-media-dependent.

Answer 1

False

Question 2

One of the advantages of a distributed database management system (DDBMS)is growth facilitation.

Answer 2

True

Question 3

A distributed database management system (DDBMS)governs the storage and processing of logically related data over interconnected computer systems.

Answer 3

True

Question 4

A transaction processor (TP)is the software component residing on each computer that stores and retrieves data located at the site.

Question 5

Current distributed database management system (DDBMS)are subject to some problems,such as the complexity of management and control

Question 6

The Internet is the repository for distributed data.

Question 7

One of the advantages of a distributed database management system (DDBMS)is that the data is located near the site with the least demand.

Question 8

Distributed processing shares a database's logical processing among two or more physically independent sites that are connected through a network.

Question 9

Distributed processing does not require a distributed database,and a distributed database does not require distributed processing.

Question 10

Rapid ad hoc data became unnecessary in the quick-response decision-making environment.

Question 11

Distributed data access was needed to support geographically dispersed business units.

Question 12

The level of transparency supported by the distributed database management system remains the same for all systems.

Question 13

A database management system (DBMS)must have validation,transformation,and mapping functions,as well as other functions,in order to be classified as distributed.

Question 14

In order to manage distributed data,copies or parts of the database processing functions must be distributed to all data storage sites.

Question 15

The transaction processor (TP)is the software component found in each computer that requests data.

Question 16

A fully distributed database management system (DBMS)must perform all the functions of a centralized DBMS,and it must handle all necessary functions imposed by the distribution of data and processing.

Question 17

Distribution transparency is supported by a distributed data dictionary.

Question 18

One of the advantages of a distributed database management system (DDBMS)is security.

Question 19

In the single-site processing,single-site data (SPSD)scenario,all processing must be done on the end user's side of the system.

Question 20

Performance transparency ensures that the system finds the most cost-effective path to access remote data.

Question 21

A centralized database management is subject to a problem such as____________

A)a growing number of remote locations
B)maintaining and operating small database systems
C)dependence on multiple sites
D)organizational flexibility of the database

Question 22

A distributed can reference several different local or remote data processing sites.

A)request
B)site
C)data location
D)transaction

Question 23

A database management system needs to prepare the data for presentation to the end user or to an application program.

A)security
B)concurrency control
C)formatting
D)I/O interface

Question 24

A distributed database is composed of several parts known as database .

A)sections
B)fragments
C)partitions
D)parts

Question 25

transparency allows a physically dispersed database to be managed as though it were centralized.

A)Distribution
B)Transaction
C)Failure
D)Performance

Question 26

A distributed database system will support different database management systems (DBMS)that may even support different models running under different computer systems.

A)fully heterogeneous
B)fully homogeneous
C)homogeneous
D)heterogeneous

Question 27

transparency is the highest level of transparency.The end user or programmer does not need to know that a database is partitioned.

A)Performance
B)Fragmentation
C)Location
D)Local mapping

Question 28

A remote transaction,composed of several requests,may access data at multiple sites.

Question 29

A lets a single SQL statement access the data that are to be processed by a single remote database processor.

A)remote request
B)remote transaction
C)distributed request
D)distributed transaction

Question 30

A disadvantage of a distributed database management system (DDBMS)is that:

A)it is slower in terms of data access.
B)adding new sites affects other sites' operations.
C)it is processor dependent.
D)there are lack of standards.

Question 31

Under the scenario,all record- and file-locking activities are performed at the end-user location.

A)single-site processing,single-site data
B)multiple-site processing,single-site data
C)single-site processing,multiple-site data
D)multiple-site processing,multiple-site data

Question 32

Distributed processing does not require:

A)database processing functions to be distributed to all data storage sites.
B)an existing distributed database.
C)a network of interconnected components.
D)multiple sites to share processing chores.

Question 33

The processor is the software component found in each computer that requests data.It receives and processes the application's data requests.

A)database
B)transaction
C)data
D)network

Question 34

A contains the description of the entire database as seen by the database administrator.

A)distributed global dictionary
B)distributed data dictionary
C)distributed global schema
D)distributed data schema

Question 35

_____ distributed database management system (DDBMS)integrate multiple instances of the same DBMS over a network.

A)Homogeneous
B)Heterogeneous
C)Fully heterogeneous
D)Combination

Question 36

Distributed database systems do not require complex mechanisms to manage transactions and ensure the database's consistency and integrity.

Question 37

In theory,a(n)can be an independent centralized database management system with proper interfaces to support remote access from other independent database management systems in the network.

A)transaction processor
B)application processor
C)transaction manager
D)data processor

Question 38

transparency exists when the end user or programmer must specify the database fragment names but does not need to specify where these fragments are located.

A)Transaction
B)Location
C)Local mapping
D)Fragmentation

Question 39

A DDBMS is subject to which of the following restrictions?

A)Multiple instances of the same database should be integrated over a network.
B)All database processing must be done at a single site.
C)Rapid ad hoc data access is not possible.
D)Remote data access is provided on a read-only basis.

Question 40

transparency allows data to be updated simultaneously at several network sites.

A)Transaction
B)Distribution
C)Failure
D)Performance

Question 41

fragmentation refers to the division of a relation into attribute subsets.

A)Data
B)Horizontal
C)Vertical
D)Mixed

Question 42

is the delay imposed by the amount of time required for a data packet to make a round trip from point A to point B.

A)Data distribution
B)Replica transparency
C)Network latency
D)Network partitioning

Question 43

management ensures that data move from one consistent state to another.

Question 44

In a basic distributed processing environment,the distributed processing system shares the database chores among three sites connected through a .

Question 45

In a distributed database management system (DDBMS),query is used to find the best access strategy.

Question 46

A user-friendly is one advantage of a distributed database management system (DDBMS).

Question 47

The rule requires that all copies of data fragments be identical.

A)shared fragment
B)mutual consistency
C)horizontal fragmentation
D)replication

Question 48

fragmentation allows a user to break a single object into two or more segments,or fragments.

A)Horizontal
B)Vertical
C)Data
D)Request

Question 49

The guarantees that if a portion of a transaction operation cannot be committed,all changes made at the other sites participating in the transaction will be undone to maintain a consistent database state.

A)DO-UNDO-REDO protocol
B)two-phase commit protocol (2PC)
C)coordinator protocol
D)write-ahead protocol

Question 50

The objective of optimization is to minimize the total cost associated with the execution of a request.

A)data
B)remote
C)transaction
D)query

Question 51

A request lets a single SQL statement reference data located at several different local or remote DP sites.

A)distributed
B)transaction
C)fragmented
D)remote

Question 52

A(n)database stores each database fragment at a single site.

A)partially replicated
B)unreplicated
C)fully replicated
D)partitioned

Question 53

fragmentation refers to the division of a relation into subsets of tuples.

A)Vertical
B)Horizontal
C)Data
D)Mixed

Question 54

A transaction processor is also known as the processor.

Question 55

One of the advantages of a distributed database management system (DDBMS)is less danger of a single- failure.

Question 56

The distributed database system must be of the computer hardware system.

Question 57

In a distributed database management system (DDBMS),occurs to determine the data location of local and remote fragments.

Question 58

One of the advantages of a distributed database management system (DDBMS)is operating cost.

Question 59

One of the advantages of a distributed database management system (DDBMS)is processor .

Question 60

In a distributed database management system (DDBMS),control is used to manage simultaneous data access and ensure data consistency across database fragments.

Question 61

Explain the difference between homogeneous and heterogeneous distributed database management systems (DDBMS).

Question 62

The protocol is used by a DP to roll transactions back and forward with the help of the system's transaction log entries.

Question 63

Describe any five of the 12 commandments formulated by C.J.Date for distributed databases.

Question 64

What is transaction transparency? What are some of the basic concepts that one should know to understand how transactions are managed in a distributed database management system (DDBMS)?

Question 65

Typically,the scenario requires a network file server running conventional applications that are accessed through a network.

Question 66

The scenario is typical of most mainframe and midrange UNIX/LINUX server database management systems (DBMS)

Question 67

describes the process of deciding where to locate data

Question 68

Discuss the CAP Theorem and the three desirable properties it mentions.

Question 69

The fragment condition indicates that no row has a duplicate,regardless of the fragment in which it is located.

Question 70

Describe performance transparency and heterogeneity transparency.

Question 71

The database description,known as the distributed schema,is the common database schema used by local transaction processors (TPs)to translate user requests into subqueries that will be processed by different data processors (DPs).

Question 72

The forces the log entry to be written to permanent storage before the actual operation takes place.