Which mongodb tool is used to report details on number of database operations in MongoDB?
Which option can be used with update command so that a new document gets created if no matching document is found based on the query condition?
Consider a collection posts which has fields: Jd, post_text, post_author, post_timestamp, post_tags etc. Which of the following query retrieves ONLY the key named post_text from the first document retrieved?
If you have created a compound index on (A,B, C) which of the following access pattern will not be able to utilize the index?
