AWS Certified Developer - Associate Questions and Answers (Dumps and Practice Questions)

Question :

Company B has created an e-commerce site using DynamoDB and is designing a products table
that includes items purchased and the users who purchased the item. When creating a primary
key on a table which of the following would be the best attribute for the primary key?
Select the BEST possible answer.



1. user_id where there are many users to few products
2. product_id where there are many products to few users category_id
3. where there are few categories to many products
4. None of the above



Correct Answer : 1
When designing tables it is important for the data to be distributed evenly across the entire table. It is best practice for performance to set your primary key where there are many primary keys to few rows. Example would be many users to few products. An example of bad design would be a primary key of product_id where there are few products but many users





Question : What happens, by default, when one of the resources in a CloudFormation stack cannot be created?


1. Previously-created resources are kept but the stack creation terminates.
2. Previously-created resources are deleted and the stack creation terminates.
3. The stack creation continues, and the final results indicate which steps failed.
4. CloudFormation templates are parsed in advance so stack creation is guaranteed to succeed.

Correct Answer : 2

Explanation: By default, the "automatic rollback on error" feature is enabled. This will cause all AWS resources that AWS CloudFormation created successfully for a stack up to the point where an error occurred to be deleted. This is useful when, for example, you accidentally exceed your default limit of Elastic IP addresses, or you don't have access to an EC2 AMI you're trying to run. This feature enables you to rely on the fact that stacks are either fully created, or not at all, which simplifies system administration and layered solutions built on top of AWS CloudFormation.





Question :

For best performance when retrieving data from a table, what "type" of API call should you perform?


1. scan
2. query
3. query then scan
4. filtered


Correct Answer : 2

The query API call queries the primary key field only. The scan API call will scan all fields and rows in the database for a result set. With larger tables the scan API call will have a severe reduction in performance.

Related Questions

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Question : Company B provides an online image recognition service and utilizes SQS to decouple system components for scaleability
. The SQS consumers poll the imaging queue as often as possible to keep end-to-end throughput as high as possible.
However, Company B is realizing that polling in tight loops is burning CPU cycles and increasing costs with empty responses.
How can Company B reduce the number empty responses? "Hint: these are API calls; if you're using an SDK, the SDK might use
a different method name to make this API call but still executes the same API call below against AWS."
"Tip: Understand why the message is correct and what the other API calls do. You might expect to see
a question worded differently, with a different answer, but have the exact same answer options."



1. Set the imaging queue VisibilityTimeout attribute to 20 seconds
2. Set the imaging queue ReceiveMessageWaitTimeSeconds Attribute to 20 seconds
3. Access Mostly Uused Products by 50000+ Subscribers
4. Set the DelaySeconds parameter of a message to 20 seconds


Question :

Which of the following statements about SQS is true?



1. Messages will be delivered exactly once and messages will be delievered in First in, First out order
2. Messages will be delivered exactly once and message delivery order is intermediate
3. Access Mostly Uused Products by 50000+ Subscribers
4. Messages will be delivered one or more times and message delivery order is intermediate


Question : Amazon SQS max message size is ____.



1. 64KB
2. 128KB
3. Access Mostly Uused Products by 50000+ Subscribers
4. 16KB



Question : Company Acmeshell is using Amazon SQS to decouple their systems for scaleability. However, they need to send messages up to Kb in size.
What might Company Acmeshell do in order to send more than 256KB of data?

1. Request an increase of the message limit by contacting Amazon
2. Set the MaximumMessageSize attribute to 456KB
3. Access Mostly Uused Products by 50000+ Subscribers
4. Any of the above


Question :

Which of the following is true if long polling is enabled?



1. The reader will listen to the queue until a message is available or until timeout
2. If long polling is enabled, then each poll only polls a subset of SQS servers; in order for all messages to be received, polling must continuously occur
3. Access Mostly Uused Products by 50000+ Subscribers
4. Increases costs because each request lasts longer


Question :

The unique ID for an IAM entity is not available in the IAM console. To get the unique ID, you can use the CLI or API calls.
Which of the following API call will help to get unique ID as per their resources.



1. ListInstanceProfiles
2. ListInstanceProfilesForRole
3. Access Mostly Uused Products by 50000+ Subscribers
4. ListRoles
5. All of the above