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Difficulty: HardData Lifecycle Management and Retention

An enterprise is designing a data storage solution on Azure Blob Storage for an application that processes transactional logs. The storage requirements are as follows:

* Newly generated logs are accessed frequently for the first 30 days, and queries require sub-second retrieval times.
* Logs between 31 and 90 days old are accessed occasionally for monthly reports, and must also be available with sub-second retrieval times.
* Logs older than 90 days are rarely accessed but must be retained for 5 years to comply with regulatory audits. For these audits, a retrieval latency of up to 15 hours is acceptable.
* Storage costs must be minimized, and early deletion charges must be avoided.

Which two actions should you include in the lifecycle management policy to meet these requirements? (Select two.)

  1. Transition blobs to the cool tier 30 days after creation.Answer
  2. Transition blobs to the archive tier 90 days after creation.Answer
  3. C
    Transition blobs to the cold tier 30 days after creation.
  4. D
    Transition blobs to the archive tier 30 days after creation.

Answer

Transition blobs to the cool tier 30 days after creation, and transition blobs to the archive tier 90 days after creation.
The correct strategy transitions the blobs to the cool tier after 30 days and to the archive tier after 90 days. This satisfies the sub-second retrieval requirement for the first 90 days (via hot and cool tiers) and complies with the 5-year retention requirement via the archive tier. Since the blobs spend 60 days in the cool tier (from day 30 to day 90), they exceed the cool tier's 30-day minimum retention threshold, preventing early deletion fees.

Step-by-Step Solution

1
Analyze access frequency and latency requirements for each phase of the lifecycle.
Days 0-30 require Hot (frequent, sub-second). Days 31-90 require Cool or Cold (occasional, sub-second). Days 91+ require Archive (rare, high latency up to 15 hours).
This establishes the candidate storage tiers for each phase.
2
Evaluate minimum retention periods to prevent early deletion charges during transitions.
Transitioning from Hot to Cold at day 30, and then to Archive at day 90, keeps data in the Cold tier for only 60 days. This violates the 90-day minimum retention limit for the Cold tier, triggering charges. Transitioning to Cool at day 30 and then to Archive at day 90 keeps data in the Cool tier for 60 days, which safely exceeds the 30-day minimum retention for Cool.
This determines whether the Cool or Cold tier is appropriate for the middle phase.
3
Verify Archive tier compliance and duration.
Transitioning to the Archive tier at day 90 meets the 15-hour retrieval latency constraint via standard rehydration. The data remains in the Archive tier for approximately 5 years, which easily satisfies the 180-day minimum retention requirement for the Archive tier.
This ensures the final archiving step is cost-effective and compliant.

Key Concept

Azure Blob Storage lifecycle management tiers and minimum retention limits.
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Topics

Data Lifecycle Management and Retention

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