DBMS

DBMS

    Usage of preemption and transaction rollback prevents.

a.     Unauthorized usage of data files

b.     Deadlock situation

c.      Data manipulation

d.     File preemption

Ans. Deadlock situation

    Views are useful for ____ unwanted information and for collecting together information from more than one relation in a single view.

a.     Hiding

b.     Deleting

c.      Highlighting

d.     All above

Ans. Hiding

    The decision tree classifier is widely used technique for.

a.     Classification

b.     Association

c.      Partition

d.     Clusters

Ans. Classification

     Thoma’s write rule is ____.

a.     2-phase locking protocol

b.     1-phase locking protocol

c.      Time stamp ordering protocol

d.     Sliding window protocol

Ans. Time stamp ordering protocol