C100DBA Practice Questions

A.  

Multi-statement transactions

B.  

Joins

C.  

Authentication

A.  

mongos

B.  

mongo shell

C.  

individual language drivers

D.  

mongod

A.  

$slice

B.  

$

C.  

All of the above

D.  

$ elemMatch

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.

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

A.  

mongodump

B.  

mongostat

C.  

mongoimport

D.  

mongoexport

A.  

backup mongodb deployment

B.  

audit mongodb deployment

C.  

performance tune mongodb deployment

D.  

replicate mongodb deployments

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

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.

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