Discussion
Locks placed by the DBMS are called ________ .
Answer: A
Correct answer: implicit locks
Locks placed by the DBMS on its own initiative, to enforce the isolation level in force, are implicit. An explicit lock is one the application requests by command. Most locking in practice is implicit, which is the point of declaring an isolation level: the developer states what must be prevented and leaves the DBMS to arrange it.
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