Object-Oriented and Classical Software Engineering 8th Edition by Stephen Schach

تمرين 6

In some applications, an alternative to lookahead can be achieved by cleverly ordering the transactions. For example, the original problem caused by a modification followed by a deletion of the same master file record could have been solved by processing a deletion before a modification. This would have resulted in the master file being written correctly and an error message appearing in the exception report. Investigate whether there is an ordering of the transactions that can solve all the difficulties listed in Problems 5.2 through 5.4.