SQS COPY

Question 1

True or False: SQS messages cannot be delivered multiple times.

Answer 1

False.

Question 2

A single SQS request can have from 1 to __________ messages, up to a maximum total payload of __________.

Answer 2

10. 256KB.

Question 3

Define “visibility timeout.”

Answer 3

A period of time during which SQS prevents other consumers from receiving and processing a message.

Question 4

True or False: In SQS, a message will remain visible for 24 hours by default.

Answer 4

False. Visibility times out after 12 hours by default.

Question 5

True or False: SQS guarantees FIFO delivery of messages.

Answer 5

False.

Question 6

A single SQS API call with a 256KB payload will be billed as __________ requests.

Answer 6

Four.

Question 7

What is the purpose of long polling in SQS?

Answer 7

It helps reduce costs by reducing the number of empty responses and eliminating false empty responses.

Question 8

What is the maximum retention period for an SQS message?

Answer 8

14 days.

Question 9

How much do FIFO SQS queue requests cost (per million requests)?

Answer 9

$0.50

Question 10

What is the maximum long poll timeout?

Answer 10

20 seconds.

Question 11

Long polling doesn’t return a response until __________, or the long poll times out.

Answer 11

A message arrives in the queue.

Question 12

A period of time during which SQS prevents other consumers from receiving and processing a message is called the __________.

Answer 12

Visibility timeout.

Question 13

True or False: SQS can be configured for auto-scaling.

Answer 13

True.

Question 14

What size chunks are SQS messages billed at?

Answer 14

64KB.

Question 15

What is the minimum size of an SQS message?

Answer 15

1 byte.

Question 16

True or False: Your first 1 million SQS requests per month are free.

Answer 16

True.

Question 17

What is the maximum size of an SQS message?

Answer 17

256KB.

Question 18

Long polling doesn’t return a response until a message arrives in the queue, or __________.

Answer 18

The long poll times out.

Question 19

With respect to message delivery, what should you do if your system requires that order be preserved?

Answer 19

Include sequencing info in the message so you can reorder the messages after the queue returns them.

Question 20

Your EC2 instances download jobs from an SQS queue. However, they’re taking too long to process the messages. What API call can you use to extend the length of time to process the jobs?

Answer 20

ChangeMessageVisibility.

Question 21

True or False: SQS messages can be delivered in any order.

Answer 21

True.

Question 22

In SQS, to give yourself more time to process a message, what action could you take?

Answer 22

Use the ChangeMessageVisibility action to extend the message’s visibility timeout.

Question 23

In SQS, what is the maximum amount of time that a message will remain visible?

Answer 23

12 hours.

Question 24

SQS provides __________ message delivery.

Answer 24

At least once.

Question 25

What is the maximum visibility of an SQS message in a queue?

Answer 25

12 hours.

Question 26

The default visibility timeout for an SQS message is __________.

Answer 26

30 seconds.

Question 27

In SQS, what is the default amount of time that a message will remain visible?

Answer 27

12 hours.

Question 28

True or False: SQS supports exactly-once message delivery.

Answer 28

False. SQS only guarantees at-least-once message delivery.

Question 29

SQS supports delivery of each message _______.

Answer 29

At least once.

Question 30

What SQS mechanism helps reduce costs by reducing the number of empty responses?

Answer 30

Long polling.

Question 31

What does the ChangeMessageVisibility SQS action do?

Answer 31

It restarts the timout period using the a new value.

Question 32

How much do Standard SQS queue requests cost (per million requests)?

Answer 32

$0.40

Question 33

Which Amazon service can you use in conjunction with SQS to “fan out” SQS messages to multiple queues?

Answer 33

SNS.

Question 34

True or False: Every SQS action counts as a request.

Answer 34

True.

Question 35

True or False: SQS does not guarantee first in, first out message delivery.

Answer 35

True.