DynamoDB

Question 1

DynamoDB Max size of an item is…

Answer 1

400KB

Question 2

Mode that needs to have capacity planned beforehand

Answer 2

Provisioned

Question 3

Mode that has read/writes auto scale up/down with workloads

Answer 3

On-Demand

Question 4

Write Capacity Units equation

Answer 4

Items per second * (item size/1KB) = WCUs

Question 5

Write 6 items per second with item size 4.5KB equals how many WCUs

Answer 5

30 WCUs

Question 6

Write 120 items per minute with item size 2 KB equals how many WCUs

Answer 6

4 WCUs

Question 7

If you read just after a write, it’s possible to get some stale data because of

Answer 7

Eventually Consistent Read

Question 8

If you read just after a write, you get the correct data

Answer 8

Strongly Consistent Read

Question 9

Default Consistent Read mode

Answer 9

Eventually

Question 10

Read Capacity Units equation - SCR

Answer 10

Reads per second * (item size/4KB)

Question 11

SCR 10 per second with item size of 6KB equals how many RCUs?

Answer 11

20 RCUs

Question 12

ECR 16 per second with item size of 12KB equals how many RCUs

Answer 12

24 RCUs

Question 13

Error “ProvisionedThroughputExceededException” happens because of

Answer 13

Throttling

Question 14

Hot Keys can cause

Answer 14

Throttling

Question 15

Hot Partitions can cause

Answer 15

Throttling

Question 16

Very large items can cause

Answer 16

Throttling

Question 17

Use cases of unknown workloads and unpredictable app traffic are good for which capacity mode

Answer 17

On-Demand

Question 18

Creates new item or fully replace an old item

Answer 18

PutItem

Question 19

Edits an existing item’s attributes or adds a new item if it doesn’t exist

Answer 19

UpdateItem

Question 20

Accept a write/update/delete only if conditions are met, otherwise return error

Answer 20

Conditional Writes

Question 21

Read based on primary key

Answer 21

GetItem

Question 22

Read entire table and then filter out data

Answer 22

Scan

Question 23

Use __ Scan for faster performance

Answer 23

Parallel

Question 24

Delete data

Answer 24

DeleteItem

Question 25

Quicker deletion than DeleteItem

Answer 25

DeleteTable

Question 26

Alternative Sort key that must be defined at table creation time

Answer 26

Local Secondary Index

Question 27

Up to _ LSI per table

Answer 27

5

Question 28

Alternative primary key from the base table that can be added/modified after table creation

Answer 28

Global Secondary Index

Question 29

If writes are throttled on the Global Secondary Index, then the main table will…

Answer 29

be throttled

Question 30

Must provision RCUs & WCUs for this type of index

Answer 30

GSI

Question 31

Can solve “Hot Key” problem in DynamoDB

Answer 31

DynamoDB Accelerator (DAX)

Question 32

T/F: DAX is Multi-AZ

Answer 32

True

Question 33

CLI command used to retrieve one or more attributes

Answer 33

–projection-expression

Question 34

CLI command to filter items before return to you

Answer 34

–filter-expression

Question 35

CLI command that specify that AWS retrieves the full list of items but with a larger # of API calls

Answer 35

–page-size

Question 36

CLI command to specify the max # of items to show in the CLI (returns NextToken)

Answer 36

–max-items

Question 37

CLI command to specify the last NextToken to retrieve the next set of items

Answer 37

–starting-token

Question 38

Transactions consume _x WCUs & RCUs

Answer 38

2

Question 39

One or more GetItem operations

Answer 39

TransactGetItems

Question 40

One or more PutItem, UpdateItem, and DeleteItem operations

Answer 40

TransactWriteItems

Question 41

Read Capacity Units equation - ECR

Answer 41

(Reads per second / 2) * (item size / 4KB) = RCUS