A concurrency-control policy such as this one leads to ______ performance, since it forces transactions to wait for preceding transactions to finish before they can start.
A. Good
B. Average
C. Poor
D. Unstable
Answer:A
A concurrency-control policy such as this one leads to ______ performance, since it forces transactions to wait for preceding transactions to finish before they can start.
A. Good B. Average C. Poor D. Unstable
Explanation: It provides a poor degree of concurrency.