Compare the deferred-modification and immediate-modification version of the log-based recovery schemes, in terms of ease of implementation and overhead cost.

Create a row trigger which ensures that whenever salary is updated in the emp table, then some message is displayed to the user and if new salary is lesser than old salary display the difference between both the salaries.

Create a package which contains function to ask the user to enter the student’s marks and determine the GRADE according to the following criteria. >90 A >80AND <90 B >70AND <80 C >60 AND<70 D <60 F

Create a trigger which will work before deletion in employee table and print a message “Deletion started”