itsmostafa/certified-aws-developer-associate-notes

2023 AWS developer associate exam

certified-aws-developer-associate-notes's Issues

S3 - KMS Quotas

The notes state:

“If using SSE-KMS encryption, you may be limited to your AWS limits for KMS usage (~100s - 1000s downloads / uploads per second)”

The KMS quota in regions like us-east-1 is 50,000 requests per second for symmetric encrypt/decrypt per the documentation

Worth noting how bucket keys address this problem, as per the
documentation.

Lambda: invocation

Synchronous invocation happens when the function is invoked as follows: API Gateway

Worth noting that API Gateway can asynchronously invoke Lambda, per (documentation)[https://docs.aws.amazon.com/apigateway/latest/developerguide/set-up-lambda-integration-async.html].

S3 Consistency

The notes state:

“This is true, except if we did a GET before to see if the object existed
ex: (GET 404 -> PUT 200 -> GET 404) - eventually consistent”

It appears that this is no longer true. There is no longer any mention of it in the documentation.

See this S.O. answer documenting the timeline of the change.

Concern about EBS Section

Hi!

Thanks for this repository! It's really helpful!

Just curious, isn't this section about Elastic BeanStalk, and somehow it has appear in Block Storages page?

https://github.com/itsmostafa/certified-aws-developer-associate-notes/blob/master/1-aws-fundamentals/ebs.md#eb-deployment-modes

Thank you!

AWS DVA-C02 exam update

There's a new exam update with many additional services and features on existing services which needs to be updated.

Elastic Beanstalk section is wrongly added under EBS

https://github.com/mostafa-abdo/certified-aws-developer-associate-notes/blob/master/1-aws-fundamentals/ebs.md

ebs has section for beanstalk. not sure if that was intentional.

DynamoDB Sessions: EBS

Notes state:

EBS & Instance store can only be used as local caching, they are not shared

Documentation states that EBS Multi-Attach is possible.

If this is not suited for the specific Store Session State topic, please clarify.

Open this note when taking the examination?

Hi, thanks you alot for your notes. It helps me alot.
I am preparing for the online exam and i have a question for you
During the examination, can i reference your note?

S3 Consistency: Delete

The notes state:

“If we delete an object, we might still be able to retrieve it for a short time
ex: (DELETE 200 -> GET 200)”

It appears that this is no longer true per the documentation:

“A process deletes an existing object and immediately tries to read it. Amazon S3 does not return any data because the object has been deleted.”

AWS Lambda memory change

New memory is upto 10gb from 3gb previously

Step Functions: description

Step Functions allow to build visual workflows which are used to orchestrate Lambda Functions

This is arguable misleading, as Step Functions is not limited to orchestrating Lambda Functions.

For example, AWS's introduction makes sure to include other AWS services.

Step Functions is a serverless orchestration service that lets you combine AWS Lambda functions and other AWS services to build business-critical applications.

Indeed, other Optimized integrations include:

AWS Batch | ✓ | ✓ |  
DynamoDB | ✓ |   |  
Amazon ECS/AWS Fargate | ✓ | ✓ | ✓
Amazon SNS | ✓ |   | ✓
Amazon SQS | ✓ |   | ✓
AWS Glue | ✓ | ✓ |  
SageMaker | ✓ | ✓ |  
Amazon EMR | ✓ | ✓ |  
Amazon EMR on EKS | ✓ | ✓ |  
CodeBuild | ✓ | ✓ |  
Athena | ✓ | ✓ |  
Amazon EKS | ✓ | ✓ |  
API Gateway | ✓ |   | ✓
AWS Glue DataBrew | ✓ | ✓ |  
Amazon EventBridge | ✓ |   | ✓
AWS Step Functions

S3 Consistency: Replacement

The notes state:

“If we read an object after updating, we might get the older version
ex: (PUT 200 -> PUT 200 -> GET 200 (might be older version))”

It appears that this is no longer true per the documentation:

“A process replaces an existing object and immediately tries to read it. Amazon S3 returns the new data.”

Lambda: Memory Limit

Allocated memory (128M to 3G)

Per documentation:

Function memory allocation	128 MB to 10,240 MB, in 1-MB increments.

DynamoDB: AZ's

replication accross 3 AZs

Citation needed.

Documentation states:

is automatically replicated across multiple Availability Zones in an AWS Region

Linked documentation does not specifically cite the number of AZ's.

DynamoDB: On-Demand Capacity

DynamoDB Provisioned Throughput
Table must have a provisioned read and write capacity

Omission: On-Demand Capacity. See documentation.

DynamoDB: JOIN, SUM

Do not support join, can't perform aggregations such as "SUM"

Might be worth mentioning this EMR Integration work-around, per documentation.

DynamoDB: WCU consumption

PutItem - write data to DynamoDB (create data or full replace data)
Consumes WCU
UpdateIem - update data in DynamoDB (partial update of attributes)
Possibility to use Atomic Counters and increas them

Worth noting that UpdateItem also consumes WCU, per documentation.

S3 Object Keys

The notes state:

"Objects (files) have a Key. The key is the FULL path:
<my_bucket>/my_file.txt"

But the documentation gives an example:

“Suppose that your bucket (admin-created) has four objects with the following object keys:

Development/Projects.xls”

Here the object keys do not include the bucket.

See:
Documentation

Lambda: DLQ

DQL

DLQ

per documentation

Step Functions: EC2 Integrations

Can also integrate with EC2, ECS, on premise servers, API Gateway

Clarification needed.

EC2 is an AWS SDK Integration per documentation.

arn:aws:states:::aws-sdk:ec2.[apiAction]

But not an Optimized integration per documentation.

ECS, and API Gateway are both an Optimized integration and an AWS SDK Integration.

Clarification required for on premise servers. Perhaps you mean managing on-premise servers via the SSM AWS SDK Integration?

arn:aws:states:::aws-sdk:ssm.[apiAction]

EBS Boot Volume Support

Only GP2 and IO1 can be used as boot volumes

Documentation as of 9.14.21 states that Boot Volume is supported by all General Purpose SSD and Provisioned IOPS SSD volumes, as well as Magnetic standard volumes.

DynamoDB: Sessions - EFS & Lambda

Notes state:

EFS can not be used with Lambda

Documentation states that this integration is possible.

If it remains unsuited for the specific Store Session State topic, please clarify.

Static website

Could you publish a static website via GitHub pages and add a link to readme?
It would be more readable for me (and hopefully some other people).

Btw, great work!

Best,
Piotr