Quick Answer
The answer is BackupRetentionPeriod. This modification takes effect immediately without requiring a reboot because the backup retention window is managed by AWS at the storage layer, independent of the database engine’s running state. When you adjust the number of days for automated backups, RDS applies the change in the background without interrupting active connections or requiring an instance restart. On the AWS Certified Database Specialty DBS-C01 exam, this concept tests your understanding of which pending modifications are applied dynamically versus those that demand a reboot, such as DB instance class or parameter group changes. A common trap is assuming all pending modifications require a reboot, but backup retention, along with settings like the backup window and deletion protection, are applied instantly. Remember the mnemonic “B.R.A.D.” for Backup retention, Backup window, and Deletion protection—these three modifications take effect immediately without a reboot.
This DBS-C01 practice question tests your understanding of management and operations. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A database administrator runs the above CLI command. The DB instance has pending modifications. Which modification will take effect immediately without requiring a reboot?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "immediately / without restart"
Why it matters: Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
BackupRetentionPeriod
Backup retention change is applied immediately.
DBInstanceClass
Why wrong: Instance class change requires reboot.
MasterUserPassword
Why wrong: Password change requires reboot.
AllocatedStorage
Why wrong: Storage change requires reboot.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
BackupRetentionPeriod
Option C is correct because changing the backup retention period takes effect immediately without reboot. Option A is incorrect because it requires a reboot. Option B is incorrect because it requires a reboot. Option D is incorrect because it requires a reboot.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
BackupRetentionPeriod
Why this is correct
Backup retention change is applied immediately.
Clue confirmation
The clue word "immediately / without restart" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
DBInstanceClass
Why it's wrong here
Instance class change requires reboot.
MasterUserPassword
Why it's wrong here
Password change requires reboot.
AllocatedStorage
Why it's wrong here
Storage change requires reboot.
Common exam traps
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Identify which DBS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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FAQ
Management and Operations — This question tests Management and Operations — Read the scenario before looking for a memorised answer..
The correct answer is: BackupRetentionPeriod — Option C is correct because changing the backup retention period takes effect immediately without reboot. Option A is incorrect because it requires a reboot. Option B is incorrect because it requires a reboot. Option D is incorrect because it requires a reboot.
Identify which DBS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Yes — watch for: "immediately / without restart". Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 20, 2026
This DBS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DBS-C01 exam.
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