In Section 20.7 we described a policy for a concurrency control that dealt with both forward and compensating operations and guaranteed that schedules were reducible. Generalize this policy to include undo operations using the conditions on the commutativity described in that section, and showthat your generalization preserves reducibility.

Case-Based Critical Thinking QuestionsCase 1Prishna has decided that data entry for the database for her small business would be expedited if she designed a form for her two employees who maintain her records. She studies the tools available to her on the Design tab, to maximize the work that these resources can accomplish for her. Prishna wants to put some instructions on the form, so that a new, third employee whom she is hiring will have no trouble using the database. Which of the following tools can Prishna use to do this?

A. Line B. Text Box C. Label D. Rectangle

A ____ database is only used for simple Web applications and monitoring capabilities. InnoDB is disabled with this option and all resources are allocated to the MyISAM.

A. transactional B. multifunctional C. non-transactional D. universal