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Good News !!! C100DBA MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) is now Stable and With Pass Result

C100DBA Practice Exam Questions and Answers

MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4)

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Total Questions : 132

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Question # 1

Which features of relational database management systems were deliberately omitted in MongoDB and help us to obtain horizontal scalability? Check all that apply.

Options:

A.  

Multi-statement transactions

B.  

Joins

C.  

Authentication

Discussion 0
Question # 2

In a sharded replicas set environment with multiple mongos servers, which of the following would decide the mongos failover?

Options:

A.  

mongos

B.  

mongo shell

C.  

individual language drivers

D.  

mongod

Discussion 0
Question # 3

Which are the ONLY ways to project portions of an array?

Options:

A.  

$slice

B.  

$

C.  

All of the above

D.  

$ elemMatch

Discussion 0
Question # 4

The difference between $push and $addToSet is:

Options:

A.  

$addToSet needs the fields to be already present while $push will work even if the field is not present

B.  

$addToSet adds the item to the field only if it does not exist already; while $push pushes the item to the field irrespective of whether it was present or not

C.  

$addToSet adds the item to the field only if the new item is of the same datatype

D.  

There is no major difference between them. $addToSet is a deprecated version of $push.

Discussion 0
Question # 5

What does the totalKeysExamined field returned by the explain method indicate?

Options:

A.  

Number of documents that match the query condition

B.  

Number of index entries scanned

C.  

Details the completed execution of the winning plan as a tree of stages

D.  

Number of documents scanned

Discussion 0
Question # 6

Which mongodb tools allow us to work with our data in a human readable format?

Options:

A.  

mongodump

B.  

mongostat

C.  

mongoimport

D.  

mongoexport

Discussion 0
Question # 7

What is the use of mongodump and mongorestore tools?

Options:

A.  

backup mongodb deployment

B.  

audit mongodb deployment

C.  

performance tune mongodb deployment

D.  

replicate mongodb deployments

Discussion 0
Question # 8

Which of the following is correct about MongoDB?

Options:

A.  

MongoDB supports geospatial indexes

B.  

MongoDB supports some of the SQL functions

C.  

MongoDB uses JSON format to represent documents

D.  

MongoDB supports collection joins

Discussion 0
Question # 9

Which of the following statements are true about the $match pipeline operator? Check all that apply.

Options:

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.

Discussion 0
Question # 10

Using an arbiter allows one to easily ensure an odd number of voters in replica sets. Why is this important?

Options:

A.  

To help in disaster recovery

B.  

To protect agains network partitions

C.  

To enable certain read preference settings

D.  

To add greather redundancy

E.  

For more efficient backup operations

Discussion 0
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