A. “rolling backup”
B. “roll backup”
C. “rolling commit”
D. none of the mentioned
In sharded clusters, delayed members have limited utility when the __________ is enabled.
MongoDB indexes use a _______ data structure.
Select the correct statement :
MongoDB supports the creation of user-defined ascending/descending indexes on a ______ field of a document.
The ______ index is unique and prevents clients from inserting two documents with the same value for the _id field.