The answer is READ COMMITTED because it reduces deadlocks in Amazon Aurora MySQL by changing isolation level from REPEATABLE READ, which holds shared locks on all rows examined during a transaction until commit, to a level that releases locks on read rows immediately after the statement completes. This shorter lock duration minimizes contention and the likelihood of circular lock waits, while still providing consistent statement-level reads without dirty reads. On the AWS Certified Database Specialty DBS-C01 exam, this question tests your understanding of how MySQL isolation levels directly impact locking behavior and deadlock frequency—a common trap is confusing REPEATABLE READ’s snapshot consistency with SERIALIZABLE’s increased locking, or incorrectly assuming SNAPSHOT ISOLATION is available in MySQL. Remember the memory tip: “Repeat locks longer, Read Committed locks shorter—fewer deadlocks for your Aurora daughter.”
DBS-C01 Management and Operations Practice Question
This DBS-C01 practice question tests your understanding of management and operations. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 using Amazon Aurora MySQL-Compatible Edition. The database has frequent deadlocks, and the application team suspects that the isolation level is causing the issue. The current isolation level is REPEATABLE READ. The team wants to reduce deadlocks while maintaining data consistency. Which isolation level should be recommended?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
READ COMMITTED
Option A is correct because READ COMMITTED reduces locking and is less prone to deadlocks compared to REPEATABLE READ, while still providing consistent reads at the statement level. Option B is wrong because READ UNCOMMITTED can cause dirty reads and is not typically used for transactional databases. Option C is wrong because SERIALIZABLE increases locking and can increase deadlocks. Option D is wrong because SNAPSHOT ISOLATION is not directly supported by MySQL; it is a SQL Server feature.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
READ UNCOMMITTED
Why it's wrong here
READ UNCOMMITTED allows dirty reads, which can lead to data inconsistency issues.
✓
READ COMMITTED
Why this is correct
READ COMMITTED reduces the number of locks held, thereby decreasing the likelihood of deadlocks while still preventing dirty reads.
Related concept
Static NAT maps one inside address to one outside address.
✗
SNAPSHOT ISOLATION
Why it's wrong here
SNAPSHOT ISOLATION is not a valid isolation level for Amazon Aurora MySQL; it is specific to Microsoft SQL Server.
✗
SERIALIZABLE
Why it's wrong here
SERIALIZABLE increases locking and can actually increase the occurrence of deadlocks.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DBS-C01 NAT questions on configuration and troubleshooting.
Management and Operations — This question tests Management and Operations — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: READ COMMITTED — Option A is correct because READ COMMITTED reduces locking and is less prone to deadlocks compared to REPEATABLE READ, while still providing consistent reads at the statement level. Option B is wrong because READ UNCOMMITTED can cause dirty reads and is not typically used for transactional databases. Option C is wrong because SERIALIZABLE increases locking and can increase deadlocks. Option D is wrong because SNAPSHOT ISOLATION is not directly supported by MySQL; it is a SQL Server feature.
What should I do if I get this DBS-C01 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DBS-C01 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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