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QUESTION: 6

The MongoDB explain() method does not support which of the following verbosity mode:

executionStats
queryPlanner
customExecutionStats
allPlansExecution

Answer(s): A

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?

db.posts.finOne({},{_id:0, post_text:1})
db.posts.findOne({post_text: 1})
db.posts.find({},{_id:Of post_text:1})
db.posts.finOne«},{post_text:l})

Answer(s): A

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QUESTION: 8

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?

Answer(s): B

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