Explanation:MongoDB uses reader-writer locks that allow concurrent readers shared access to a resource, such as a database or collection, but give exclusive access to a single write operation. 5. Point out the wrong statement :
A. Beginning with version 3.0, MongoDB ships with the WiredTiger storage engine
B. Some global operations, typically short lived operations involving multiple databases, still require a global “instance-wide” lock
C. The MMAPv1 storage engine uses collection-level locking
D. None of the mentioned
Answer:A
Explanation:MongoDB uses reader-writer locks that allow concurrent readers shared access to a resource, such as a database or collection, but give exclusive access to a single write operation. 5. Point out the wrong statement :
A. Beginning with version 3.0, MongoDB ships with the WiredTiger storage engine B. Some global operations, typically short lived operations involving multiple databases, still require a global “instance-wide” lock C. The MMAPv1 storage engine uses collection-level locking D. None of the mentioned