Atomicity: –Suppose that, just before the execution of transaction Ti , the values of accounts A and B are $1000 and $2000, respectively. –Now suppose that, during the execution of transaction Ti , a failure occurs that prevents Ti from completing its execution successfully. –Further, suppose that the failure happened after the write(A) operation but before the write(B) operation. –In this case, the values of accounts A and B reflected in the database are $950 and $2000. The system destroyed $50 as a result of this failure. –In particular, we note that the sum A + B is no longer preserved.