1.
(  ) is a DBMS feature that reverses the current transaction out of the database. returning the data to its former state.
A(n)(  ) is performed when processing a transaction fails at come point, and it is necessary to start over.

 

2.
This is defines as golding true in a relation, R, if and only if
 every determinant in R is a candidate key. What is this? <--

 


3.

A is a relation with cardinality 3 and degree 5 and B is a relation with cardinality 4 and degree 2.
 When we combine relation A and B by the cartesian product, what relation does come out?





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