MongoDB C100DBA Online Practice Questions and Exam Preparation

MongoDB C100DBA Online Questions & Answers

• Question 101:

  In what format does mongodump creates backup files?

  A. BSON
  B. JSON
  C. SOAP
  D. XML
  A. BSON

• Question 102:

  `$set' sets the value of

  A. Code block
  B. Name/value pair
  C. Key
  D. None of the above
  C. Key

• Question 103:

  Which format/standard is used by MongoDB internally to store documents?

  A. JSON
  B. BSON
  C. B+ Trees
  D. JSON - Extended
  A. JSON

• Question 104:

  Consider that our posts collection contains an array field called tags that contains tags that the user enters. {

  

  Which of the following commands will find all the posts that have been tagged as tutorial.

  A. db.posts.find( { tags : ["tutorial"] } );
  B. db.posts.find( { $array : {tags: "tutorial") > );
  C. db.posts.find( { tags : "tutorial" } );
  D. db.posts.findInArray( { tags : "tutorial" > );
  C. db.posts.find( { tags : "tutorial" } );

• Question 105:

  What does the following $slice query return using the following command? db.posts.find( {}, { comments: { $slice: [ -10, 5 ] } } )

  A. Returns 5 comments, beginning with the last 10 items
  B. Returns 10 comments, beginning with the last
  C. Returns 10 comments, beginning with the first
  D. Returns 5 comments, beginning with the first 10 items
  A. Returns 5 comments, beginning with the last 10 items

• Question 106:

  The oplog (operations log) is a special capped collection that keeps a rolling record of all operations that modify the data stored in your databases. All the replica set members contain a copy of the oplog in the following collection:

  A. .oplog.rs
  B. oplog.rs
  C. ..oplog.rs
  D. local.oplog.rs
  D. local.oplog.rs

• Question 107:

  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
  C. Replication

• Question 108:

  Which of the following commands will return all the posts with number of likes greater than 100 and less than 200, both inclusive?

  A. db.posts.find({ likes : { $gte : 100 , $lte : 200 } } );
  B. db.posts.find({ likes : { $gt : 100 , $lte : 200 } } );
  C. db.posts.find({ likes : { $gte : 100, $lt : 200 } } );
  D. db.posts.find({ likes : { $gt : 100, $lt : 200 > > );
  A. db.posts.find({ likes : { $gte : 100 , $lte : 200 } } );

• Question 109:

  'mongoimport' command is used for

  A. Batch data insertion
  B. None of the above
  C. Multiple command import
  D. Multiple command insertion
  A. Batch data insertion

• Question 110:

  Which of the following does MongoDB use to provide High Availability and fault tolerance?

  A. Sharding
  B. Indexing
  C. Replication
  D. Write Concern
  C. Replication