For example, as we saw earlier, the database is temporarily inconsistent
while the transaction to transfer funds from A to B is executing, with the
deducted total written to A and the increased total yet to be written to B. If a
second concurrently running transaction reads A and B at this intermediate
point and computes A+B, itwill observe an inconsistent value. Furthermore,
if this second transaction then performs updates on A and B based on the
inconsistent values that it read, the database may be left in an inconsistent
state even after both transactions have completed.