State which of the following operations has a compensating operation.
a. Give all employees a 10% raise.
b. Give all employees making less than |S10,000 a 10% raise.
c. Set the value of a particular item to 12.
d. Insert a newtuple with key 1111 into the database, and set the value of one of its
attributes to 12.
e. Set the value of a particular item to the square of its original value.
a. Yes. Give all employees a 9.09.09% decrease.
b. No. There is no way for a compensating operation to know whether or not
to give a decrease to an employee whose salary after the original operation is, for
example, |S10,100.
c. No. There is no way for a compensating operation to know what the value of
the item was before the original operation
d. Yes. Delete the tuple with key 1111.
e. No. There is no way for a compensating operation to know what the sign of the
original value was.
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