C100DBA Exam Questions

What is the replication factor for a replicated cluster with 1 primary, 3 secondaries with one of them hidden. The set also has an arbiter?

Aggregation Pipelines have a limit of:

You are in a sharded cluster. What will you do prior to initiating backup in sharded cluster?

Which mongodb tool is used to report details on number of database operations in MongoDB?

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 c...

What is the output of the following program?

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

The difference between $push and $addToSet is:

If the value of totalKeysExamined is 30000 and the value of totalDocsExamined is 0, which of the following option is correct?

We can insert multiple documents in bulk using which of the following operations:

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 hav...

When should we consider representing a one-to-many relationship in an embedded collection instead of separate collection?

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?

Below is a sample document of "orders" collection

What does the output x of the following MongoDB aggregation query result into; db.posts.aggregate( [ { $group: { _id; "$author", x: { $sum: $likes } } } ] )

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

Which of the following is true about sharding?

JSON stands for

Which of the following is correct about MongoDB?

Which mongodb tool is used to report details on number of database operations in MongoDB?

Which of the following operator can be used to limit the number of documents in an array field of a document after an update is performed?

The________operator can be used to identify an element in the array to be updated without explicitly specifying the position of the element.

Which command can be used to rebuild the indexes on a collection in MongoDB?

Which of the following collections stores authentication credentials in MongoDB?

What does the following query do when performed on the posts collection? db.posts.update({_id:l},{Title:This is post with ID 1"})

Which of the following aggregation commands in MongoDB does not support sharded collections?

Which is the correct order (lowest to highest) in which MongoDB compares the BSON types?

Which is the default mode in which the explain() command runs?

Which of the following operators is used to updated a document partially?

In a replica set, a_________number of members ensures that the replica set is always able to select a primary.

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...

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

As per the aggregation pipeline optimization concepts, if you have a $sort followed by a $match:

Which of the following about Capped Collections is correct?

Which option can be used with update command so that a new document gets created if no matching document is found based on the query condition?

What is the equivalent command in MongoDB for the following SQL query? SELECT * FROM posts WHERE author like "%john%"

The MongoDB explain() method does not support which of the following verbosity mode:

The MongoDB explain() method does not support which of the following verbosity mode:

Mongodb does provide high availability via which option?

Which of the following index would be optimum for the query? Select all valid. db.test.find( { a : 5, c : 2 })

Which of the following node is used during election in a replication cluster?

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

Which of the following is supported by MongoDB?

Consider a collection posts which has fields: Jd, post_text, post_author, post_timestamp, post_tags etc. Which of the following query retrieves ONLY the key named post_text from th...

A collection and a document in MongoDB is equivalent to which of the SQL concepts respectively?

Which option can be used with update command so that a new document gets created if no matching document is found based on the query condition?

Write the command(s) are correct to enable sharding on a database "testdb" and shard a collection "testCollection" with _id as shard key. Answer: sh.enableSharding("testdb") & sh.s...

Which of the following command is used to get all the indexes on a collection?

You have designed a web application with mongoDB. You have configured replication. The replica set is in place and function properly. What happens in case of failure?

To add a new user and enable authentication in MongoDB, which of the following steps need be executed?