Distributed Databases

Q1: 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

Q2: 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.

Q3: A distributed database has which of the following advantages over a centralized database?

A Software cost

B Software complexity

C Slow Response

D Modular growth

Q4: 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

Q5: 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

Q6: 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

Q7: 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.

Q8: A transaction manager is which of the following?

A Maintains a log of transactions

B Maintains before and after database images

C Maintains appropriate concurrency control

D All of the above.

Q9: 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.

Q10: 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.

Q11: 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 All of the attributes are sent from one site to another and then only the required rows are returned.

Q12: 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.

Q13: An autonomous homogenous environment is which of the following?

A The same DBMS is at each node and each DBMS works independently.

B The same DBMS is at each node and a central DBMS coordinates database access.

C A different DBMS is at each node and each DBMS works independently.

D A different DBMS is at each node and a central DBMS coordinates database access.

Q14: 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.

Q15: Location transparency allows for which of the following?

A Users to treat the data as if it is at one location

B Programmers to treat the data as if it is at one location

C Managers to treat the data as if it is at one location

D All of the above.


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