Index Notes in mongoDB

Lecture Notes
In this video, Dwight mentions that the index is used automatically if it is present. This is no longer always true if you are sorting using a sparse index, but remains true otherwise. He also uses the ensureIndex command, which is deprecated as of MongoDB 3.0 in favor of createIndex
Quiz: Index Notes
A MongoDB index can have keys of different types (i.e., ints, dates, string)
1.True
2.False


Ans.
True
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