1.

MongoDB uses a ____________ lock that allows concurrent read access to a database but exclusive write access to a single write operation.(a) readers(b) readers-writer(c) writer(d) none of the mentioned

Answer» The correct answer is (b) readers-writer

To elaborate: Before version 2.2, this lock was implemented on a per-mongod basis. Since version 2.2, the lock has been implemented at the database level.


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