AWS Managed Immutable Ledger with QLDB

SAA-C03 By islever Editorial Last updated

Determine appropriate data security controls.

Short answer

D Copy the records into an Amazon Quantum Ledger Database (Amazon QLDB) ledger to meet immutable and verifiable log requirements.

Question

A company maintains its accounting records in a custom application that runs on Amazon EC2 instances. The company needs to migrate the data to an AWS managed service for development and maintenance of the application data. The solution must require minimal operational support and provide immutable, cryptographically verifiable logs of data changes. Which solution will meet these requirements MOST cost-effectively?
  1. Copy the records from the application into an Amazon Redshift cluster.
  2. Copy the records from the application into an Amazon Neptune cluster.
  3. Copy the records from the application into an Amazon Timestream database.
  4. Copy the records from the application into an Amazon Quantum Ledger Database (Amazon QLDB) ledger. Correct Answer

Key Takeaways

The question tests knowledge of ledger databases by highlighting 'immutable' and 'cryptographically verifiable' as the defining features of Amazon QLDB.

Amazon QLDB is the cost-effective, fully managed service that provides immutable and cryptographically verifiable transaction logs for accounting records.

Common mistake: Learners often choose Redshift or Neptune because they are popular managed database services, but they do not natively provide the specific immutable ledger capabilities required.

Expert Analysis

Why the Answer Is Correct

Amazon QLDB (Quantum Ledger Database) is a fully managed, serverless ledger database that provides a transparent, immutable, and cryptographically verifiable transaction log. It meets all requirements: it is an AWS managed service (minimal operational support), stores application data, and ensures immutability through a centralized trusted authority that prevents tampering. This makes it ideal for financial and accounting records where audit trails are critical.

Why the Other Options Are Wrong

Amazon Redshift (Option A) is a data warehouse optimized for analytics, not immutable transaction logging. Amazon Neptune (Option B) is a graph database for connected data relationships, lacking native immutable ledger features. Amazon Timestream (Option C) is designed for time-series IoT data, which does not align with the requirement for cryptographically verifiable change logs in accounting.

Community Comment Notes

Community consensus strongly supports Option D. As user Scheldon noted, "Amazon Quantum Ledger Database (Amazon QLDB) is a fully managed ledger database that provides a transparent, immutable, and cryptographically verifiable transaction log." Multiple users highlighted that the keywords 'immutable' and 'cryptographically verifiable' directly point to QLDB's core value proposition.

Official Reference

https://docs.aws.amazon.com/qldb/latest/developerguide/what-is.html

This link opens the official vendor documentation in a new tab.

Exam Strategy

When you see 'immutable' and 'cryptographically verifiable' in an AWS exam question, think immediately of Amazon QLDB. It is the only managed database service specifically designed for this purpose.

Frequently Asked Questions

Why not use DynamoDB Streams for immutability?

DynamoDB Streams capture changes but are not inherently immutable or cryptographically verifiable against tampering like QLDB's central ledger authority.

Is QLDB more expensive than Redshift?

QLDB is generally cost-effective for transactional ledgers compared to provisioning a full Redshift cluster, especially given its serverless nature.

More SAA-C03 FAQ →

Community Votes

D
100%

100% of anonymous learners picked answer D. Votes are pick records left by other test-takers — they are not the verified answer.

Discussion 7 contributions

Compiled from public community threads and reader submissions, lightly edited for clarity. Handles and vote tallies are shown as recorded, and comments reflect the views of individual contributors.

From public community threads 7

  1. asdfcdsxdfc 👍 5 Answered D
    Amazon QLDB • QLDB stands for ”Quantum Ledger Database” • A ledger is a book recording financial transactions • Fully Managed, Serverless, High available, Replication across 3 AZ • Used to review history of all the changes made to your application data over time • Immutable system: no entry can be removed or modified, cryptographically verifiable
  2. Scheldon 👍 4 Answered D
    AnswerD Amazon Quantum Ledger Database (Amazon QLDB) is a fully managed ledger database that provides a transparent, immutable, and cryptographically verifiable transaction log owned by a central trusted authority. https://docs.aws.amazon.com/qldb/latest/developerguide/what-is.html
  3. [Removed] 👍 3 Answered D
    https://aws.amazon.com/qldb/ Amazon Quantum Ledger Database (Amazon QLDB) is a fully managed ledger database that provides a transparent, immutable, and cryptographically verifiable transaction log.
  4. f07ed8f 👍 3 Answered D
    Amazon Quantum Ledger Database (Amazon QLDB) is a fully managed ledger database that provides a transparent, immutable, and cryptographically verifiable transaction log.
  5. Mikado211 👍 3 Answered D
    immutable, cryptographically verifiable ==> Amazon QLDB
Show 2 more comments
  1. Andy_09 👍 7
    Option D
  2. NayeraB 👍 2 Answered D
    D is correct

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