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NEW QUESTION 51
Which mongodb tool is used to report details on number of database operations in MongoDB?
- A. mongotop
- B. mongorestore
- C. mongostat
- D. mongodump
Answer: C
NEW QUESTION 52
Below is a sample document in a given collection test.
{ a : 5, b : 3, c: 2, d : 1 >
Given a compound index { a: 1, b:l, c:l, d:l}, Which of the below query will not use in-memory sorting? Select all valid.
- A. db.test.find( { a: 5, b: 3 } ).sort( { a: 1} )
- B. db.test.find( { a: 5, b: 3 } ).sort( {c: 1 } )
- C. db.test.find( { a: 5, b: 3 } ).sort( { a: 1, b: 1, c: 1 > )
- D. db.test.find( { a: 5, b: 3 } ).sort( { c: 1, d : 1 } )
Answer: B,D
NEW QUESTION 53
Which of the documents below will be retrieved by the following query? Assume the documents are stored in a collection called "sample". Check all that apply.
db.sample.find( { "$or" : [ { "a" : { "$in" : [ 3, 10] > }, { "b" : { "$lt" : 2 > > ] > )
- A. {".Jd" :: 8, "a": 11, "c": 1, "b": 0}
- B. {".Jd" :: 2, "a": 2, "c" :: 0, "b": 1}
- C. { \Jd" :10,"a": 3, "c": 1, "b": 1}
- D. {".Jd" :6, "a": 1, "c" :1, "b" :5}
- E. { ''\Jd" :9, "a": 17, "c": 1, "b": 1}
- F. {".Jd" :: 1, "a": 0, "c" :: 0, "b": 2}
- G. {".Jd" :: 5, "a": 3, "c" :: 0, "b": 12}
- H. {''__id" :3, "a": 4, "c" :0, "b" :14}
- I. {''_Jd" :7, "a": 8, "c" :1, "b" :7}
- J. {".Jd" :: 4, "a": 5, "c" :: 0, "b": 17}
Answer: A,B,C,E,G
NEW QUESTION 54
Update If Correct is an approach for which of the following concepts in MongoDB:
- A. Performance Management
- B. Transaction Management
- C. Atomicity
- D. Concurrency Control
Answer: D
NEW QUESTION 55
Which of the following is correct about MongoDB?
- A. MongoDB supports collection joins
- B. MongoDB supports some of the SQL functions
- C. MongoDB supports geospatial indexes
- D. MongoDB uses JSON format to represent documents
Answer: C
NEW QUESTION 56
You are in a sharded cluster. What will you do prior to initiating backup in sharded cluster?
- A. db.stopserver()
- B. sh.stopBalancer()
- C. sh.stopserverQ
- D. db.stopBalancer()
Answer: B
NEW QUESTION 57
What is the equivalent command in MongoDB for the following SQL query?
SELECT * FROM posts WHERE author like "%john%"
- A. db.posts.find( { author: {$like: /John/} } )
- B. db.posts.find( { author: /John/ } )
- C. db.posts.find( { $like: {author: /John/} } )
- D. db.posts.find( { author: /AjohnA/ > )
Answer: B
NEW QUESTION 58
What does the following aggregate query perform?
- A. Groups the posts by number of likes (101, 102, 103.) by adding 1 every time
- B. Calculates the number of posts with likes between 100 and 200
- C. Fetches the posts with likes between 100 and 200, sets the _id of the first document as null and then increments it 1 every time
- D. Fetches the posts with likes between 100 and 200 and sets their _id as null
Answer: B
NEW QUESTION 59
Which of the following are valid json documents? Select all that apply.
- A. {"a":l, "b":{"b":l, "c":"foo", "d":"bar", "e":[l,2,4]}}
- B. {"city":"New York", "population", 7999034, boros:{"queens", "manhattan", "staten island", "the bronx", u "brooklyn"}}
- C. {"name":"Fred Flintstone";"occupation":"Miner";"wife":"Wilma"}
- D. { }
Answer: A,D
NEW QUESTION 60
Which command is used to determine storage capacity of specific database?
- A. mongotop
- B. mongostat
- C. dbstats
- D. constats
Answer: C
NEW QUESTION 61
'$set' sets the value of
- A. None of the above
- B. Code block
- C. Name/value pair
- D. Key
Answer: D
NEW QUESTION 62
Which of the following index would be optimum for the query?
Select all valid. db.test.find( { a : 5, c : 2 })
- A. db.test.ensurelndex( { a: 1, b :1, c:l, d:l})
- B. CH db.test.ensurelndex( { a :1, c:l})
- C. db.test.ensurelndex( { a : 1, c: 1, d: 1, b : 1})
- D. db.test.ensurelndex( { c:l, a: 1})
Answer: B,C
NEW QUESTION 63
Which of the tags in a replica set configuration specify the operations to be read from the node with the least network latency?
- A. netLatency
- B. nearest
- C. primaryPreferred
- D. secondaryPreferred
Answer: B
NEW QUESTION 64
Which features of relational database management systems were deliberately omitted in MongoDB and help us to obtain horizontal scalability? Check all that apply.
- A. Multi-statement transactions
- B. Joins
- C. Authentication
Answer: A,B
NEW QUESTION 65
Which of the following node is used during election in a replication cluster?
- A. secondary
- B. primary
- C. arbiter
- D. hidden
Answer: C
NEW QUESTION 66
Write the command(s) are correct to enable sharding on a database "testdb" and shard a collection "testCollection" with _id as shard key.
Answer:
Explanation:
sh.enableSharding("testdb") & sh.shardCollection("testdb.testCollection", {_id : 1 }, true )
NEW QUESTION 67
To add a new user and enable authentication in MongoDB, which of the following steps need be executed?
- A. All of the above
- B. update users collection and run db.enableAuthenticationQ
- C. update users collection and restart mongodb with -auth option
- D. update users collection and restart mongodb
Answer: C
NEW QUESTION 68
Suposse tou have the following collection with only 2 documents:
If you run an aggregation query and use { $unwind: "$traits" } as the first stage, how many documents will be passed to the next stage of the aggregation pipeline?
- A. 0
- B. 1
- C. 2
- D. 3
- E. 4
Answer: D
NEW QUESTION 69
Which operations add new documents to a collection?
- A. delete
- B. Create
- C. insert
- D. update
Answer: B,C
NEW QUESTION 70
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