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ag-AWS S3 - SAA-C02 > S3 Object Storage Classes > Flashcards

S3 Object Storage Classes Flashcards

1
Q

At which moment can you choose a Storage Class in S3?

A

During object upload

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2
Q

What is the default Storage Class in S3?

A

S3 Standard

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3
Q

Can you change the class of an object once it was already uploaded?

A

Yes, it is easy but some conditions need to be met

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4
Q

What level of resilience does the S3 Standard Storage class have?

A

Regional resilience

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5
Q

Can the S3 Standard class tolerate the failure of an AZ?

A

Yes, because it is regionally resilient

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6
Q

How does the S3 Standard mode achieve regional resilience?

A

By replicating the objects in at least 3 AZs

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7
Q

How much % of durability does the S3 Standard class have?

A

11 9’s

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8
Q

How much % of availability does the S3 Standard class have?

A

4 9’s

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9
Q

How much % of SLAdoes the S3 Standard class have?

A

3 9’s

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10
Q

What happens if S3 breaches some SLAs?

A

AWS will give you some discounts.

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11
Q

What are the benefits of using S3 Standard?

A

Low latency and high throughput

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12
Q

What is the S3 Standard class billed for?

A
  • Data storage: GB/month fee
  • Transfer OUT of data: $ per GB
  • Price per 1000 requests
  • No retrieval fee, no minimum duration, no minimum size
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13
Q

Main UC for using S3 Standard Class?

A

Frequently accessed data which is important and non-replaceable.

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14
Q

How much cheaper is to use the S3 Standard-IA class than S3 Standard?

A

Approx. 54% cheaper

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15
Q

Is there any minimum size that each object will be charged for when using S3 Standard-IA (even when it is smaller)?

A

128 KB. For smaller objects, you might end up paying much more money.

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16
Q

Is there any minimum duration of storage that will be billed when using S3 Standard-IA

A

30 days minimum duration charge (even if you store the object for 1 day).

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17
Q

Is there any retrieval fee when using Standard-IA?

A

Yes, it is charged per GB and it is normally small.

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18
Q

Main UCs for using S3 Standard-IA

A
  1. Rapid and less frequent access.
    Data rarely needed but immediately.
  2. Long term storage like DR files
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19
Q

When is it not recommended to use S3 Standard-IA?

A

When data is constantly accessed.
When data can be easily replaced.
When data is tiny (because of the 128KB minimum fee)

20
Q

Main UCs for using S3 One Zone-IA

A
  • Secondary copies of primary data or backup copies.

- Replaceable data accessed less frequently but quickly

21
Q

how much cheaper than S3 Standard IA is S3 Zone-IA?

A

Around 80% of the base cost of standard-IA

22
Q

Is there any minimum size that each object will be charged for when using S3 One Zone-IA (even when it is smaller)?

A

128 KB

23
Q

How much % of availability does the S3 Standard-IA class have?

A

3 9’s

24
Q

How much % of SLAs does the S3 Standard-IA class have?

A

3 9’s

25
Q

How much % of availability does the S3 One Zone-IA class have?

A

99.5%

26
Q

Can the S3 One Zone-IA class stand an AZ failure?

A

No. The data is not replicated to other AZs.

27
Q

Can you retrieve immediately objects from S3 Glacier storage?

A

No, the retrieval can take minutes or hours.

28
Q

How many retrieval modes exist when using S3 Glacier?

A
  1. Expedited (1-5 minutes) - the most expensive
  2. Standard (3-5 hours)
  3. Bulk (5-12 hours) - lowest cost
29
Q

Which retrieval method would you use in S3 Glacier storage for a large set of data?

A

Bulk.

30
Q

how much cheaper than S3 Standard is S3 Glacier?

A

17% of the base cost of S3 standard

31
Q

3 main characteristics of S3 Glacier?

A

Secure, durable and low cost for archival data.

32
Q

Does data get replicated when using S3 glacier?

A

Yes, to 3+ AZs

33
Q

Is there a minimum storage duration for S3 Glacier?

A

Yes, 90 days

34
Q

Is there a minimum object charge for S3 glacier?

A

40 KB.

35
Q

UC for using S3 Glacier Storage class

A

Data that does not require immediate access and it is not frequently accessed.

36
Q

For what is S3 Glacier Deep Archive designed for?

A

Designed for long term backups and as a tape-drive replacement`

37
Q

How much cheaper than S3 Standard is S3 Glacier Deep Archive?

A

4.3% of the base cost of S3 Standard

38
Q

Is there a minimum storage duration for S3 Glacier Deep Archive?

A

180 days

39
Q

How many retrieval modes are available in S3 Glacier Deep Archive?

A
  • Standard - within 12 hours

- Bulk - within 48 hours (cheaper)

40
Q

Can a S3 Glacier Deep Archive object be made public or be downloaded normally?

A

No, due to the high retrieval time.

41
Q

Name the most common UCs for S3 Glacier Deep Archive

A
  • Any case when data needs to be accessed very rarely or never.
  • Finance
  • Health care: medical records, x-rays
  • Media: media archives, 8k productions
  • Physical security: cameras, footage
  • Scientific data surveys or research sets
  • For regulatory purposes when you are forced to store some data for X time.
42
Q

What does the S3 Intelligent-tiering class do?

A

It combines Standard and Standard IA classes.

It uses automation to remove the overhead of moving objects from one tier to another one.

43
Q

How often will an object be moved to Standard IA tier when using S3 Intelligent-tiering class?

A

After 30 days from the last access

44
Q

Does S3 Intelligent-tiering have retrieval charges?

A

No

45
Q

Does S3 Intelligent-tiering have any additional fee?

A

Yes, 0.0025$ per 1000 objects tracked (for monitoring and automation)

46
Q

Does S3 Intelligent-tiering have a minimum storage duration?

A

Yes. 30 days.

47
Q

Name some UC of S3 Intelligent-tiering

A

Good for long-lived data with changing or unknown access patterns.

ag-AWS S3 - SAA-C02 (12 decks)

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