C100DBA Exam Questions Dumps, Selling MongoDB Products
C100DBA Cert Guide PDF 100% Cover Real Exam Questions
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NEW QUESTION # 37
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 # 38
What is the defau size of a GridFS chunk?
- A. 255 K
- B. 16 MB
- C. 1 MB
- D. 2 MB
Answer: A
NEW QUESTION # 39
What tool would you use if you want to save a gif file in mongo?
Answer:
Explanation:
mongofile
NEW QUESTION # 40
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?
- A. db.posts.createIndex({comments.$.author": {$desc:l>});
- B. db.posts.createIndex({commerits.$.author":-l});
- C. db.posts.createIndex({comments.author":-l});
Answer: C
NEW QUESTION # 41
'mongoimport' command is used for
- A. Multiple command insertion
- B. Batch data insertion
- C. Multiple command import
- D. None of the above
Answer: B
NEW QUESTION # 42
Which option should be used to update all the documents with the specified condition in the MongoDB query?
- A. updateAII instead of update
- B. specify {multi : true} as the third parameter of update command
- C. specify {all: true} as the third parameter of update command
- D. specify {updateAII: true} as the third parameter of update command
Answer: B
NEW QUESTION # 43
Which of the documents below will be retrieved by the following query? Assume the documents are stored in a collection called "sample". Check all that apply.
db.sample.find( { "$or" : [ { "a" : { "$in" : [ 3, 10] > }, { "b" : { "$lt" : 2 > > ] > )
- A. {".Jd" :: 8, "a": 11, "c": 1, "b": 0}
- B. {".Jd" :: 1, "a": 0, "c" :: 0, "b": 2}
- C. {".Jd" :: 4, "a": 5, "c" :: 0, "b": 17}
- D. {''_Jd" :7, "a": 8, "c" :1, "b" :7}
- E. { ''\Jd" :9, "a": 17, "c": 1, "b": 1}
- F. {".Jd" :6, "a": 1, "c" :1, "b" :5}
- G. { \Jd" :10,"a": 3, "c": 1, "b": 1}
- H. {''__id" :3, "a": 4, "c" :0, "b" :14}
- I. {".Jd" :: 2, "a": 2, "c" :: 0, "b": 1}
- J. {".Jd" :: 5, "a": 3, "c" :: 0, "b": 12}
Answer: A,E,G,I,J
NEW QUESTION # 44
In what format does mongodump creates backup files?
- A. JSON
- B. SOAP
- C. BSON
- D. XML
Answer: C
NEW QUESTION # 45
Which of the following statements are true about the $match pipeline operator? Check all that apply.
- A. You should use it early as possible in the pipeline
- B. It has a sintax similar to findQ commands.
- C. It can be used as many time as needed.
Answer: A,B,C
NEW QUESTION # 46
In a replica set, a_________number of members ensures that the replica set is always able to select a primary.
- A. 0
- B. Even
- C. Depends on the application architecture
- D. Odd
Answer: D
NEW QUESTION # 47
What is the replication factor for a replicated cluster with 1 primary, 3 secondaries with one of them hidden. The set also has an arbiter?
- A. 0
- B. 1
- C. 2
- D. None of the above
Answer: A
NEW QUESTION # 48
You are comparing values of different BSON types in mongodb. You want to compare from lowest to highest.
Which comparison order is used?
- A. MinKey, Null, Numbers,Object,Array,BinData,Symbol, String
- B. Objec^Array^inData,Symbol, String,MinKey, Null, Numbers
- C. MinKey, Null, Numbers,Symbol, String,Object,Array,BinData
- D. Object/Array^inData/Symbol,MinKey, Null, Numbers,String
Answer: C
NEW QUESTION # 49
Which of the following collections stores authentication credentials in MongoDB?
- A. system.users
- B. users.users
- C. test.users
- D. local.users
Answer: A
NEW QUESTION # 50
Which of the following needs to be performed prior to initiate backup on a sharded cluster?
- A. sh.stopBalancer( )
- B. db.stopBalancer( )
- C. db.stopServer( )
- D. sh.stopServer( )
Answer: A
NEW QUESTION # 51
Update If Correct is an approach for which of the following concepts in MongoDB:
- A. Transaction Management
- B. Atomicity
- C. Performance Management
- D. Concurrency Control
Answer: D
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: 1, c: 1 > )
- B. db.test.find( { a: 5, b: 3 } ).sort( { c: 1, d : 1 } )
- C. db.test.find( { a: 5, b: 3 } ).sort( {c: 1 } )
- D. db.test.find( { a: 5, b: 3 } ).sort( { a: 1} )
Answer: B,C
NEW QUESTION # 53
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?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: B
NEW QUESTION # 54
Which of the following is a valid insert statement in mongodb? Select all valid.
- A. db.test.insert({x:2},{y:"apple"})
- B. db.test.push({x:2,y:"apple"})
- C. db.test.insert({"x":2, "y":"apple"})
- D. db.test.insert({x:2,y:"apple"})
Answer: C,D
NEW QUESTION # 55
You are comparing values of different BSON types in mongodb. You want to compare from lowest to highest. Which comparison order is used?
- A. MinKey, Null, Numbers,Object,Array,BinData,Symbol, String
- B. Objec^Array^inData,Symbol, String,MinKey, Null, Numbers
- C. MinKey, Null, Numbers,Symbol, String,Object,Array,BinData
- D. Object/Array^inData/Symbol,MinKey, Null, Numbers,String
Answer: C
NEW QUESTION # 56
Below is a sample document of "orders" collection
- A. $sort
Answer: A
NEW QUESTION # 57
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