How I passed AWS Certified Developer - Associate Exam (827/1000) - AWS Ep 3

How to prepare for AWS Certified Developer - Associate Exam - AWS Ep 3.

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See how I passed other AWS Certificate Exams here: https://www.youtube.com/playlist?list=PLK0ZC7fyo01IBhit29klrSjuIdH4TotsL

How did I prep for it?
1. I took the course on https://www.aws.training/ which is three-day training with instructor-led course and hands-on labs. Very informational and inspirational. I learned things that I barely get a chance to use on my day-to-day work.
2. I took all 6 complete practice tests on https://www.whizlabs.com/, this is a great time saver when it comes to prepare for your upcoming exams. Being prepared is the key to success. I'd like to get a true feeling of what it feels like when I sit in the testing center. https://www.whizlabs.com/ does give me such an opportunity before walking into the testing center. Second, its Explanation section is enormously helpful: the detailed comment/description/explanation saves your time to doing some research on your own.

And make sure to use code: FISHERCODER before you check out to get a nice discount! :)
https://www.whizlabs.com/aws-developer-associate/

Here’s the notes that I jotted down while prepping for this exam:

DynamoDB:
https://aws.amazon.com/dynamodb/faqs/

DynamoDB TTL can delete items in a DDB table based on TTL values you specify.
Amazon DynamoDB Accelerator (DAX):
DAX (DynamoDB Accelerator) is a dedicated service designed to cache DynamoDB requests. It’ll automatically add the data in DAX if there’s a cache miss or update the data if it is updated in the table.
fast in-memory performance, from single-digit milliseconds to microseconds
For strongly consistent read requests from an application, DAX cluster passes all requests to DDB & does not cache for these requests.

One read request unit represents one strongly consistent read request, or two eventually consistent read requests, for an item up to 4KB in size.
You want to read 540 items of 6KB each every minute using strong consistency mode, how many RCUs do you need?
1 RCU provides 4KB read per second for strong consistency model
so you’ll need 6KB/4KB = 1.50, round off to the nearest one, 2 RCU
540/60 = 9 items per second
so total 9 * 2 = 18 RCUs.

Your app writes 150 items every second, each item is 4KB, how many WCU do you need?
1 WCU provides 1KB write per second
4KB/1KB = 4 WCU
so, total 4 * 150 = 600 WCUs
Remember to round up to 1
How many WCU is needed to support 100 writes per second of 512 bytes?
512/1024 = 0.5 should rounded up to 1, so we’ll need 1 * 100 = 100 WCU

Make sure to be familiar with the simple math mentioned above, this is something you don’t want to miss in the real exam, it’s almost guaranteed at least one question will ask you to do this math. I got one, not two, not none, in mine. :)

ProjectionExpression with Scan operation could fetch the entire table with only the columns mentioned in the ProjectionExpression attribute.

Using the Global Secondary Index you can create a different pair of Partition and Sort key even after table creation for better search performance.
GSI does not support Consistent Read, it only supports Eventual Read. For other tables, Query with Consistent Read will provide the latest results without scanning the whole table.

Due to the text size limit of this YouTube description box, continue to read my detailed notes here please:
https://www.reddit.com/r/AWSCertifications/comments/g00432/passed_aws_certified_developer_associate_exam/

Topics to study for:
Domain 1: Deployment (22%)
Domain 2: Security (26%)
Domain 3: Development with AWS Services (30%)
Domain 4: Refactoring (10%)
Domain 5: Monitoring and Troubleshooting (12%)

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Видео How I passed AWS Certified Developer - Associate Exam (827/1000) - AWS Ep 3 канала Fisher Coder