Atlas cluster creation basics in MongoDB - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Understanding Cluster Tier Selection

When creating an Atlas cluster, which factor primarily determines the cluster tier you should select?

A The amount of data storage and workload performance needed

B The color scheme of the Atlas dashboard

C The number of users logged into the Atlas UI

D The version of MongoDB installed on your local machine

💡 Hint

Think about what affects how powerful your cluster needs to be.

Cluster tier selection depends mainly on the storage size and performance requirements of your application workload.

❓ query_result

intermediate

Output of Cluster Creation Status Query

After creating a cluster in Atlas, you run the command to check cluster status. What output indicates the cluster is ready?

MongoDB

atlas clusters describe <clusterName>

A {"stateName": "READY"}

B {"stateName": "CREATING"}

C {"stateName": "IDLE"}

D {"stateName": "DELETING"}

💡 Hint

Look for the state that means the cluster is fully operational.

The "READY" state means the cluster is fully created and operational.

📝 Syntax

advanced

Correct JSON Format for Cluster Configuration

Which JSON snippet correctly defines a cluster configuration with 3 nodes and M10 tier in Atlas?

A {"providerSettings": {"instanceSizeName": "M10"}, "nodes": 3}

B {"providerSettings": {"instanceSizeName": "M10"}, "numNodes": 3}

C {"providerSettings": {"instanceSizeName": "M10"}, "numShards": 3}

D {"providerSettings": {"instanceSizeName": "M10"}, "shards": 3}

💡 Hint

Atlas uses 'numShards' to specify the number of shards (nodes) in a cluster.

The correct key to specify the number of nodes in a cluster configuration is 'numShards'.

❓ optimization

advanced

Optimizing Cluster Region Selection

To reduce latency for users in Europe and Asia, which Atlas cluster configuration is best?

A Create a single-region cluster in North America

B Create a multi-region cluster with nodes in both Europe and Asia

C Create separate clusters for Europe and Asia with no replication

D Create a cluster only in Asia and use VPN for Europe users

💡 Hint

Think about where the data is stored relative to users.

Multi-region clusters place nodes closer to users in different regions, reducing latency.

🔧 Debug

expert

Identifying Cause of Cluster Creation Failure

You receive an error when creating an Atlas cluster: "Invalid providerSettings: instanceSizeName not supported in selected region." What is the cause?

A The cluster name contains invalid characters

B The network access IP whitelist is empty

C The MongoDB version is incompatible with the cluster tier

D The chosen cluster tier is not available in the selected cloud provider region

💡 Hint

Check if the tier is supported where you want to deploy.

Some cluster tiers are not available in all cloud provider regions, causing this error.