MongoDB C100DBA Exam Questions

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MongoDB C100DBA Sample Questions

Question # 1

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 can be used as many time as needed.
 C. It has a sintax similar to findQ commands. 

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Question # 2

Consider the following document: > db.c.find() { "_id" : 12, b : [ 3, 5, 7, 2, 1, -4, 3, 12 ] } Which of the following queries on the "c" collection will return only the first five elements of the array in the "b" field? E.g., Document you want returned by your query: { "_id" : 12, "b" : [ 3, 5, 7, 2, 1 ] > 

A. db.c.find( { > , { b : { $slice : [ 0 , 5 ] } } ) 
B. db.c.find( { b : [ 0 , 5 ] > ) 
C. db.c.find( { > , { b : { $substr[ 0 , 5 ] > > ) 
D. db.c.find( { > , { b : [ 0, 1, 2, 3, 4, 5 ] > ) 
E. db.c.find( { > , { b : [ 0 , 5 ] > ) 

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Question # 3

What tool do you use if you want to extract a CSV from mongo? 

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Question # 4

Which of the following is true of the mechanics of replication in MongoDB? Check all that apply.

 A. Members of a replica set may replicate data from any other data-bearing member of the set by default 
B. Clients read from the nearest member of a replica ser by default 
C. Operations on the primary are recorded in a capped collection called the oplog

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Question # 5

What tool do you use to see if you have a problem in the consumption of disk I / 0?

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Question # 6

What tool would you use if you want to save a gif file in mongo? 

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Question # 7

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 

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Question # 8

In order to ensure that you can maintain high availability in the face of server failure, you should implement which of the following? 

A. Sharding 
B. Properly defined user roles 
C. Replication 
D. Put indexes on all of your documents 
E. The proper storage engine 

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Question # 9

Which of the following is a valid insert statement in mongodb? Select all valid.

 A. db.test.push({x:2,y:"apple"}) 
B. db.test.insert«"x":2, "y":"apple"}) 
C. db.test.insert({x:2,y:"apple"}) 
D. db.test.insert({x:2},{y:"apple"}) 

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Question # 10

Which of the following are common uses of the mongo shell? Check all that apply 

A. Perform queries against MongoDB collections 
B. Perform administrative tasks
 C. Use as a JavaScript framework for your production system 

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Question # 11

Addding the index {a:l} can potentially decrease the speed of which of the following operations? Check all that apply.

 A. db.collection.update({b:456>, {$inc: {a:l> })
 B. db.collection.find( {a : 232} ) 
C. db.collection.insert( { a:341}) 

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Question # 12

Which of the following is a valid Replica Set configuration if you want: 1-Have 3 copies of everything 2- That RS3 is never primary 2- That RSI and RS2 can be primary? You had to see the different configurations, RS3 could be hidden or priority 0 (But not a referee because we need 3 replicas), while RSI and RS2 could NOT have priority 0 or be hidden or anything like that In a 4-member RS RSO , RSI, RS2 and RS3 + Referee, RSO (primary) falls after some write operations that have replicated RSI and RS2 (but NOT RS3), who can get up as the new primary? The configuration comes and in it we see that RS2 has a hidden: true (or a priority: 0, (I don't remember) 

A. ORS1 
B. ORS2
 C. ORS3 
D. O arbiter 
E. RSO

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Question # 13

Consider the following example document: { "_id": Objectld("5360c0a0a655a60674680bbe"), "user" "login": "irOn" "description": "Made of steel" "date": ISODate("2014-04-30T09:16:45.836Z"), } >a nd index creation command: db.users.createlndex( { "user.login": 1, "user.date": -1 }, "mylndex" ) When performing the following query: db.users.find( { "user.login": /Air.*/ }, { "user":1, "_id":0 > ).sort( { "user.date":1 > ) which of the following statements correctly describe how MongoDB will handle the query? Check all that apply. 

A. As an optimized sort query (scanAndOrder = false) using "mylndex" because we are sorting on an indexed field 
B. As an indexed query using "mylndex" because field "user.login" is indexed 
C. MongoDB will need to do a table/collection scan to find matching documents 
D. None of the above 
E. As a covered query using "mylndex" because we are filtering out "_id" and only returning "user.login" 

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