Which lock should be obtained to prevent a concurrent transaction from executing a conflicting read, insert or delete operation on the same key value.
A. Higher-level lock
B. Lower-level lock
C. Read only lock
D. Read write
Answer:A
Which lock should be obtained to prevent a concurrent transaction from executing a conflicting read, insert or delete operation on the same key value.
A. Higher-level lock B. Lower-level lock C. Read only lock D. Read write