C100DBA Exam Questions

What does the following aggregate query perform?

Which of the following commands finds all the documents in the posts collection with post timestamp field as null?

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

Aggregation Pipelines have a limit of:

Which option should be used to update all the documents with the specified condition in the MongoDB query?

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

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

Which command is used to determine storage capacity of specific database?

What is the maximum size of a MongoDB document

What is the maximum size of a MongoDB document?

Consider that you have a collection called population which has fields state and city. Which of the following query will calculate the population grouped by state and city?

Which of the following does MongoDB use to provide High Scalability?

Which of the following are valid json documents? Select all that apply.

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

'mongoimport' command is used for

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...

You are comparing values of different BSON types in mongodb. You want to compare from lowest to highest. Which comparison order is used?

In what format does mongodump creates backup files?

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

Consider the following posts document: Which of the following queries will return the documents but with only the first two tags in the tags array?

Which node in a replica set does accept write operation?

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

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?

Which operations add new documents to a collection?

Consider the following document from the products collection: What does the following query using $elemMatch return? db.products.find( { product_code: "345678" }, { variations: { $...

Update If Correct is an approach for which of the following concepts in MongoDB:

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

Below is a sample document of "orders" collection

Which type of indexes does MongoDB support?

Consider that you have a collection called population which has fields state and city. Which of the following query will calculate the population grouped by state and city?

Which of the following is true about aggregation framework?

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?

Which of the following operator can be used to control the number of items of an array that a query returns?

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

In a replicated cluster, which of the following node would only be used during an election?

The following aggregation option is used to specify the specific fields that needs to be passed to the next stage of the aggregation pipeline:

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

In a collection that contains 100 post documents, what does the following command do? db. posts. find().skip(5).limit(5)

MongoDB is a schema-less design.

What is the output of following two commands in MongoDB: db. posts. insert({n_id":l}) db.posts.insert({"_id":l})

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?

Which of the following command inside aggregate command is used in MongoDB aggregation to filter the documents to pass only the documents that match the specified condition(s) to t...

By default, the MongoDB cursor in mongo shell is configured to return how many documents? To get the next set of documents, which command is used?

What is the use of mongodump and mongorestore tools?

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

Which of the tags in a replica set configuration specify the operations to be read from the node with the least network latency?

What is the on-premise solution having functionality equivalent to cloud manager?

In a collection that contains 100 post documents, what does the following command do? db. posts. find().skip(5).limit(5)

Which of the following is incorrect statement about find and findOne operations in MongoDB?

'$set' sets the value of