Solved MCQ on Oracle Distributed Transaction set-3

1) A mechanism which ensures that simultaneous execution of more than one transaction does not lead to any database inconsistencies is called .................. mechanism.

A. transaction control

B. transaction management

C. concurrency parallelism

D. concurrency control

2) The transaction wants only to read the data item of mode is called as .......

A. Exclusive Mode

B. Shared Mode

C. Inclusive Mode

D. Unshared Mode

3) Any execution of a set of transactions is called as its .........

A. non-serial schedule

B. serial schedule

C. schedule

D. interleaved schedule

4) ............ is program or set of program that interacts with the database at some point in its execution.

A. A database system

B. A database application

C. Both

D. none

5) .......... component of a database is responsible for ensuring atomicity and durability.

A. recovery management

B. concurrency control

C. storage management

D. query evaluation engine

6) The activity of ensuring atomicity in the presence of Transaction aborts is called ..........

A. transaction control

B. transaction management

C. transaction recovery

D. concurrency control

7) A .............is a set of rules that state when a transaction may lock or unlock each of the data items in the database

A. concurrency control

B. transaction control

C. validation control

D. locking protocol

8) .................. is a collection of programs performing all necessary action associated with a database.

A. Database associated

B. Database administrator

C. Database application

D. Database management system

9) Which protocol permits release of exclusive locks only at the end of transaction?

A. Graph based protocol

B. Strict two phase locking protocol

C. Two phase locking protocol

D. Rigorous Two phase locking protocol

10) The activity of providing Durability of the transaction is called .....

A. database control

B. transaction management

C. transaction recovery

D. database recovery

11) Which protocol allows a transaction to lock a new data item only if that transaction has not yet unlocked data item?

A. Graph based protocol.

B. Strict two phase locking protocol

C. Two phase locking protocol

D. Time stamp ordering scheme

12) .......... is a collection of application programs that interacts with the database along with DBMS.

A. A database system

B. A database application

C. Database administration

D. Data system

13) ........ ensures that once transaction completes successfully, the results of the operations become permanent.

A. serializability

B. synchronizability

C. atomicity

D. durability

14) A ....... contains information for undoing or redoing all the actions performed by the transactions.

A. save point

B. log

C. node

D. commit_point

15) A ............. is a unit of program execution that accesses and possibly updates various data items.

A. DBMS

B. monitor

C. transaction

D. transistor

16) Transaction is an action used to perform some manipulation on data stored in the ........

A. Memory

B. Record

C. Database

D. All of these

17) A transaction is terminated if it has ........

A. aborted

B. committed

C. running state

D. aborted or committed

18) The two possible communication errors are, Lost messages and .......

A. Network Partitions

B. Lost acknowledgement

C. Timeout

D. log error

19) The only way to undo the effects of a committed transaction is to execute a .......

A. committed transaction

B. compensating transaction

C. supplementary transaction

D. update query

20) In .........., one or more users/programs attempt to access the same data at the same time.

A. concurrency

B. transaction control

C. locking

D. two phase locking

Answers:

1) D. concurrency control

2) B. Shared Mode

3) C. schedule

4) B. A database application

5) A. recovery management

6) C. transaction recovery

7) D. locking protocol

8) D. Database management system

9) B. Strict two phase locking protocol

10) D. database recovery

11) C. Two phase locking protocol

12) A. A database system

13) D. durability

14) B. log

15) C. transaction

16) C. Database

17) C. running state

18) A. Network Partitions

19) B. compensating transaction

20) A. concurrency

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