The variable that keeps a running total in a loop is known as a(n) __________.
Fill in the blank(s) with the appropriate word(s).
accumulator
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Indicate whether the statement is true or false
Consider optimistic concurrency control as applied to the transactions T and U. Suppose that transactions T and U are active at the same time as one another. Describe the outcome in each of the following cases:
i) T's request to commit comes first and backward validation is used; ii) U's request to commit comes first and backward validation is used; iii) T's request to commit comes first and forward validation is used; iv) U's request to commit comes first and forward validation is used. In each case describe the sequence in which the operations of T and U are performed, remembering that writes are not carried out until after validation