MongoDB C100DBA Online Practice Questions and Exam Preparation

MongoDB C100DBA Online Questions & Answers

• Question 1:

  What is the first task that a secondary would perform on being prompted by another secondary for an election?

  A. Start the election process for primary
  B. Vote for the first secondary so that it would become the next primary
  C. Vote for itself and then call for election
  D. Connect to primary to confirm its availability
  D. Connect to primary to confirm its availability

• Question 2:

  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. 7
  B. 2
  C. 1
  C. 1

• Question 3:

  Which of the following needs to be performed prior to initiate backup on a sharded cluster?

  A. db.stopBalancer( )
  B. sh.stopServer( )
  C. db.stopServer( )
  D. sh.stopBalancer( )
  D. sh.stopBalancer( )

• Question 4:

  Which of the following aggregate commands in MongoDB uses a pipeline approach with the goals of improving the aggregation performance?

  A. mapReduce
  B. group
  C. aggregate
  D. All of the above
  C. aggregate

• Question 5:

  You have a replicated cluster with 1 primary, 3 secondary, 1 arbiter. One of the secondary is hidden. What is the replication factor of this replicated cluster?

  A. 7
  B. 03
  C. 04
  D. 06
  C. 04

• Question 6:

  What is the maximum size of Index Key Limit and Number of Indexes per collection?

  A. 1024 bytes and 64 indexes
  B. 12 mega bytes and 64 indexes
  C. 64 bytes and 1024 indexes D. 1024 bytes and unlimited indexes
  A. 1024 bytes and 64 indexes

• Question 7:

  If you have created a compound index on (A,B, C) which of the following access pattern will not be able to utilize the index?

  A. A, B, C
  B. A
  C. B, C
  D. A, B
  C. B, C

• Question 8:

  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
  C. Operations on the primary are recorded in a capped collection called the oplog

• Question 9:

  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":-l});
  B. db. posts.createIndex({^comments.author" :1});
  C. db.posts.createIndex({^commerits.author";-!});
  C. db.posts.createIndex({^commerits.author";-!});

• Question 10:

  In a sharded cluster, from which node does one stop the balancer process before initiating backup?

  A. Any node
  B. replicaset primary node
  C. config server node
  D. mongos node
  D. mongos node