(Authentic) AWS Certified Developer - Associate
Question Bank, Over 600 Questions With Correct Answers
100%
AWS SQS long polling allows the SQS service to wait until a message is available
in the queue before sending a response?
true
A visibility timeout is a period of time during which AWS SQS prevents other
consuming components from receiving and processing the message?
true
What AWS service can you use to "fan out" SQS messages to multiple queues?
SNS
(SQS) What is the maximum long poll timeout?
20 seconds
You have a fleet of EC2 instances that are constantly polling empty SQS queues
which is burning CPU complete cycles. What should you do?
Enable SQS long polling
What is the default SQS visibility time out?
30 seconds
EC2 instances download jobs from SQS queue, but are taking too long to
process. What api call can you use to the length of time to process jobs?
ChangeMessageVisibility
(SQS) You are designing a new app which processes payments and delivers
promotional emails to customers. Your need to ensure that the payment process
takes priority over the creation of emails. What is the best way to achieve this?
Use 2 SQS queues. Poll that payment queue first.
An SQS message can NOT be delivered multiple times?
False, SQS messages can be delivered multiple times
What is the default visibility timeout for SQS?
30 seconds
How long can SQS messages be?
Messages can contain up to 256 KB of text in any format
SQS was the second service on AWS?
False, SQS was the first
DynomaDB writes are measured in 2 KB per write?
False, they are measured in 1 KB per write.
What are the two consistency models used when reading data from DynamoDB?
Eventually Consistent and Strongly consistent
DynamoDB is a NoSQL database by AWS?
True
You have an app that needs 25 items of 13KB per second. Your app uses
STRONGLY consistent reads. What should the throughput be set to? (Math
problem)
,Calculate read capacity units (items up to 4 KB in size)
Multiply number of items by read capacity units
Do NOT divide by 2 because strongly consistent
Answer: 100
One read capacity unit represents one strongly consistent read per second, or
two eventually consistent reads per second, for items up to 4 KB in size?
True
When you create a table, you specify how much provisioned throughput capacity
you want to reserve for reads and writes?
True
In DynamoDB, you specify provisioned throughput requirements in terms of
capacity units?
True
One read capacity unit represents one X type of read per second, or two Y type of
read per second?
One strongly consistent read per second. Two eventually consistent reads per second.
For items up to 4 KB in size.
Application needs to read 25 items of 13KB per second. App uses EVENTUALLY
consistent reads. What should you set read throughput to?
Calculate read capacity units (items up to 4 KB in size).
Multiply number of items by read capacity units.
Divide by two because EVENTUALLY consistent.
Answer: 50
A global secondary index contains a selection of attributes from the table, but are
organized by a primary key that is different from the table's? (T/F)
True
DynamoDB local secondary indexes are fixed at 10 per table?
False, local secondary indexes are fixed at 5 per table.
Local secondary indexes give your table a choice of sort keys?
True
What are the three capacity unit sizes in DynamoDB?
One read capacity unit represents one strongly consistent read per second, for items up
to 4 KB in size.
One read capacity unit represents two eventually consistent reads per second, for items
up to 4 KB in size.
One write capacity unit represents one write per second for items up to 1 KB in size.
Using the AWS portal, you are trying to scale DynamoDB past preconfigured
maximums. Which service can be increased through AWS support?
Provisioned throughput limits
What are the steps for calculating write throughput?
Write capacity units are 1 KB per write.
Calculate items per second.
Multiply items per second by writes per item.
You have a motion sensor which writes 600 items of data every minute. Each item
is 5 KB. What should write throughput be?
,Calculate items per second.
Multiply items per second by write capacity units per item.
Answer: 50 provisioned write capacity units
What is the api call to receive multiple items from a DynamoDB table?
BatchGetItem
You have a motion sensor which writes 600 items of data every minute. Each item
consists of 5 KB. Your application uses Strongly consistent reads. What should
you set read throughput to?
Calculate items per second.
Calculate read capacity units per item.
Strongly consistent reads are up to 4 KB per read.
Multiply items per second by read capacity units per item.
Answer: 20 provisioned read capacity units
You have a motion sensor which writes 600 items of data every minute. Each item
consists of 5 KB. Your application uses eventually consistent reads. What should
you set the read throughput to?
Calculate items per second.
Calculate read capacity units per item.
Eventually consistent reads give 2 reads for items up to 4 KB.
Answer: 10 provisioned read capacity units
Steps for calculating read throughput?
Calculate items per second.
Calculate read capacity units per item (4 KB).
Multiply items per second by read capacity units per item.
If eventually consistent, divide by two.
A scan is more efficient than query in terms of performance? (T/F)
False, a query is more efficient that a scan in terms of performance.
What does the error "ProvisionedThroughputExceededException" mean?
You have exceeded your maximum allowed provisioned throughput
A scan reads every item in a table or secondary index?
Tru
What does OLTP stand for?
Online Transaction Processing (OLTP)
What does OLAP stand for?
Online analytics processing (OLAP)
Is RDS an OLAP? (T/F)
False, RDS is Online Transaction Processing (OLTP)
Is Redshift OLAP? (T/F)
True
Is DynamoDB NoSQL?
True
Is ElastiCache in memory?
True
What is more frequent Online Transaction Processing (OLTP) or Online Analytics
Processing (OLAP)?
, Online Transaction Processing (OLTP) because it is similar to a traditional query. Online
Analytics Processing (OLAP) is more of a management tool used at the end of a day.
NoSQL Notes:
NoSQL : RDS
collection: table
document: row
key value pair: fields
_id is required
can embed key value pairs (KVP)
embedded data = nested KVP
Not a question
Does DynamoDB allow embedded data structures?
No, DynamoDB allow embedded data structures; however, MongoDB does.
What is AWS proprietary database?
Aurora
Developers store session data in Elasticache?
Yes, developers store session data in Elasticache.
What are the two Elasticache engines offered?
Memcached and Redis
What is AWS in memory cache?
Elasticache
Are newly created S3 buckets public by default?
No, they are not public by default
Is 1 TB the largest size file you can transfer to S3 using a PUT?
No, the largest is 5GB. After 5 GB you must use multipart upload
What is the maximum size on S3?
5TB
Does S3 provide unlimited storage?
Yes
What is CORS?
Cross Origin Resource Sharing (CORS)
Which region is Sydney, Australia in?
ap-southeast-2
What does "ap" stand for in AWS regions?
Asian Pacific
Which region is Singapore in?
ap-southeast-1
Which region is Japan in?
ap-northwest-1
An s3 endpoint always contains?
Tee phrase "s3-website" followed by the region name
What is the link to an S3 bucket created in Japan?
https://s3-ap-northeast-1.amazonaws.com/sitename/
Do static hosted websites on S3 have www in their names?
Question Bank, Over 600 Questions With Correct Answers
100%
AWS SQS long polling allows the SQS service to wait until a message is available
in the queue before sending a response?
true
A visibility timeout is a period of time during which AWS SQS prevents other
consuming components from receiving and processing the message?
true
What AWS service can you use to "fan out" SQS messages to multiple queues?
SNS
(SQS) What is the maximum long poll timeout?
20 seconds
You have a fleet of EC2 instances that are constantly polling empty SQS queues
which is burning CPU complete cycles. What should you do?
Enable SQS long polling
What is the default SQS visibility time out?
30 seconds
EC2 instances download jobs from SQS queue, but are taking too long to
process. What api call can you use to the length of time to process jobs?
ChangeMessageVisibility
(SQS) You are designing a new app which processes payments and delivers
promotional emails to customers. Your need to ensure that the payment process
takes priority over the creation of emails. What is the best way to achieve this?
Use 2 SQS queues. Poll that payment queue first.
An SQS message can NOT be delivered multiple times?
False, SQS messages can be delivered multiple times
What is the default visibility timeout for SQS?
30 seconds
How long can SQS messages be?
Messages can contain up to 256 KB of text in any format
SQS was the second service on AWS?
False, SQS was the first
DynomaDB writes are measured in 2 KB per write?
False, they are measured in 1 KB per write.
What are the two consistency models used when reading data from DynamoDB?
Eventually Consistent and Strongly consistent
DynamoDB is a NoSQL database by AWS?
True
You have an app that needs 25 items of 13KB per second. Your app uses
STRONGLY consistent reads. What should the throughput be set to? (Math
problem)
,Calculate read capacity units (items up to 4 KB in size)
Multiply number of items by read capacity units
Do NOT divide by 2 because strongly consistent
Answer: 100
One read capacity unit represents one strongly consistent read per second, or
two eventually consistent reads per second, for items up to 4 KB in size?
True
When you create a table, you specify how much provisioned throughput capacity
you want to reserve for reads and writes?
True
In DynamoDB, you specify provisioned throughput requirements in terms of
capacity units?
True
One read capacity unit represents one X type of read per second, or two Y type of
read per second?
One strongly consistent read per second. Two eventually consistent reads per second.
For items up to 4 KB in size.
Application needs to read 25 items of 13KB per second. App uses EVENTUALLY
consistent reads. What should you set read throughput to?
Calculate read capacity units (items up to 4 KB in size).
Multiply number of items by read capacity units.
Divide by two because EVENTUALLY consistent.
Answer: 50
A global secondary index contains a selection of attributes from the table, but are
organized by a primary key that is different from the table's? (T/F)
True
DynamoDB local secondary indexes are fixed at 10 per table?
False, local secondary indexes are fixed at 5 per table.
Local secondary indexes give your table a choice of sort keys?
True
What are the three capacity unit sizes in DynamoDB?
One read capacity unit represents one strongly consistent read per second, for items up
to 4 KB in size.
One read capacity unit represents two eventually consistent reads per second, for items
up to 4 KB in size.
One write capacity unit represents one write per second for items up to 1 KB in size.
Using the AWS portal, you are trying to scale DynamoDB past preconfigured
maximums. Which service can be increased through AWS support?
Provisioned throughput limits
What are the steps for calculating write throughput?
Write capacity units are 1 KB per write.
Calculate items per second.
Multiply items per second by writes per item.
You have a motion sensor which writes 600 items of data every minute. Each item
is 5 KB. What should write throughput be?
,Calculate items per second.
Multiply items per second by write capacity units per item.
Answer: 50 provisioned write capacity units
What is the api call to receive multiple items from a DynamoDB table?
BatchGetItem
You have a motion sensor which writes 600 items of data every minute. Each item
consists of 5 KB. Your application uses Strongly consistent reads. What should
you set read throughput to?
Calculate items per second.
Calculate read capacity units per item.
Strongly consistent reads are up to 4 KB per read.
Multiply items per second by read capacity units per item.
Answer: 20 provisioned read capacity units
You have a motion sensor which writes 600 items of data every minute. Each item
consists of 5 KB. Your application uses eventually consistent reads. What should
you set the read throughput to?
Calculate items per second.
Calculate read capacity units per item.
Eventually consistent reads give 2 reads for items up to 4 KB.
Answer: 10 provisioned read capacity units
Steps for calculating read throughput?
Calculate items per second.
Calculate read capacity units per item (4 KB).
Multiply items per second by read capacity units per item.
If eventually consistent, divide by two.
A scan is more efficient than query in terms of performance? (T/F)
False, a query is more efficient that a scan in terms of performance.
What does the error "ProvisionedThroughputExceededException" mean?
You have exceeded your maximum allowed provisioned throughput
A scan reads every item in a table or secondary index?
Tru
What does OLTP stand for?
Online Transaction Processing (OLTP)
What does OLAP stand for?
Online analytics processing (OLAP)
Is RDS an OLAP? (T/F)
False, RDS is Online Transaction Processing (OLTP)
Is Redshift OLAP? (T/F)
True
Is DynamoDB NoSQL?
True
Is ElastiCache in memory?
True
What is more frequent Online Transaction Processing (OLTP) or Online Analytics
Processing (OLAP)?
, Online Transaction Processing (OLTP) because it is similar to a traditional query. Online
Analytics Processing (OLAP) is more of a management tool used at the end of a day.
NoSQL Notes:
NoSQL : RDS
collection: table
document: row
key value pair: fields
_id is required
can embed key value pairs (KVP)
embedded data = nested KVP
Not a question
Does DynamoDB allow embedded data structures?
No, DynamoDB allow embedded data structures; however, MongoDB does.
What is AWS proprietary database?
Aurora
Developers store session data in Elasticache?
Yes, developers store session data in Elasticache.
What are the two Elasticache engines offered?
Memcached and Redis
What is AWS in memory cache?
Elasticache
Are newly created S3 buckets public by default?
No, they are not public by default
Is 1 TB the largest size file you can transfer to S3 using a PUT?
No, the largest is 5GB. After 5 GB you must use multipart upload
What is the maximum size on S3?
5TB
Does S3 provide unlimited storage?
Yes
What is CORS?
Cross Origin Resource Sharing (CORS)
Which region is Sydney, Australia in?
ap-southeast-2
What does "ap" stand for in AWS regions?
Asian Pacific
Which region is Singapore in?
ap-southeast-1
Which region is Japan in?
ap-northwest-1
An s3 endpoint always contains?
Tee phrase "s3-website" followed by the region name
What is the link to an S3 bucket created in Japan?
https://s3-ap-northeast-1.amazonaws.com/sitename/
Do static hosted websites on S3 have www in their names?
