The answer is that the stored procedures fail because they use features incompatible with Aurora MySQL. Aurora MySQL is built for high compatibility with MySQL 5.6, 5.7, and 8.0, but it deliberately omits certain deprecated or non-standard MySQL features, such as specific SQL modes, storage engine-specific syntax like MyISAM-specific commands, or unsupported functions like LOAD_FILE. When migrating, these unsupported elements cause execution errors. On the AWS Certified Database Specialty DBS-C01 exam, this question tests your understanding of Aurora’s compatibility boundaries versus full MySQL, often appearing as a trap where candidates mistakenly blame configuration settings or permissions. A common memory tip is to think of Aurora as “MySQL-compatible, not MySQL-identical”—if a stored procedure relies on a feature that MySQL itself has deprecated or that is tied to a specific storage engine, Aurora will likely reject it.
DBS-C01 Deployment and Migration Practice Question
This DBS-C01 practice question tests your understanding of deployment and migration. 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 company is migrating a MySQL database to Amazon Aurora MySQL. The database has several stored procedures and triggers. During the migration, some stored procedures fail to execute. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The stored procedures use features that are not compatible with Aurora MySQL.
Aurora MySQL is designed to be compatible with MySQL 5.6, 5.7, and 8.0, but it does not support all MySQL features. Stored procedures that rely on deprecated or non-standard MySQL features, such as certain SQL modes, storage engine-specific syntax, or unsupported functions, will fail to execute after migration. This is the most common cause of stored procedure failures during a migration to Aurora MySQL.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Aurora does not support stored procedures.
Why it's wrong here
Aurora supports stored procedures.
✗
The stored procedures exceed the maximum size limit in Aurora.
Why it's wrong here
Aurora has size limits but unlikely cause of failure.
✓
The stored procedures use features that are not compatible with Aurora MySQL.
Why this is correct
Aurora MySQL has some differences; stored procedures may need modifications.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The stored procedures use MyISAM tables, which are not supported by Aurora.
Why it's wrong here
Aurora supports InnoDB, but MyISAM is not supported; however, the issue is likely not table engine alone.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may assume Aurora MySQL is a drop-in replacement for all MySQL features, but the exam tests awareness of specific incompatibilities in stored procedures, triggers, and functions that are not supported or behave differently in Aurora.
Detailed technical explanation
How to think about this question
Under the hood, Aurora MySQL uses a custom storage engine that is InnoDB-compatible, and it enforces strict SQL mode by default. Stored procedures that rely on non-default SQL modes (e.g., NO_ENGINE_SUBSTITUTION) or use features like the deprecated PROCEDURE ANALYSE() or unsupported functions such as LOAD_FILE() will fail. In real-world migrations, common culprits include procedures that reference the mysql.proc table directly or use the SIGNAL statement with unsupported SQLSTATE values.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
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
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Deployment and Migration — This question tests Deployment and Migration — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The stored procedures use features that are not compatible with Aurora MySQL. — Aurora MySQL is designed to be compatible with MySQL 5.6, 5.7, and 8.0, but it does not support all MySQL features. Stored procedures that rely on deprecated or non-standard MySQL features, such as certain SQL modes, storage engine-specific syntax, or unsupported functions, will fail to execute after migration. This is the most common cause of stored procedure failures during a migration to Aurora MySQL.
What should I do if I get this DBS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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