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MongoDB Associate Database Administrator Questions 11–15 (page: 4)

If the value of totalKeysExamined is 30000 and the value of totalDocsExamined is 0, which of the following option is correct?

Given a collection posts as shown below having a document array comments, which of the following command will create an index on the comment author descending?

Which option should be used to update all the documents with the specified condition in the MongoDB query?

Which mongodb tool is used to report details on number of database operations in MongoDB?

In a sharded replica set environment, the w Option provides ability for write concern and j Option provides ability for the data to be written on disk journal. Consider that we have a seven member replica set and we want to assure that the writes are committed to journal.
What should be the value of j?