Quick Answer
The correct answer is to partition the large tables on both the source and target databases and use multiple parallel DMS tasks. This approach directly addresses the slow full load performance by enabling AWS DMS to process different partitions concurrently, dramatically reducing the overall migration time for tables with hundreds of millions of rows. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your understanding of DMS task-level parallelism and source-side partitioning as a performance optimization strategy, often appearing as a trap where candidates mistakenly focus on LOB settings or disabling constraints. A common memory tip is to think of it as “split and sprint”—partition the data to split the workload, then sprint with parallel tasks to meet tight downtime windows.
This SAP-C02 practice question tests your understanding of accelerate workload migration and modernization. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 its on-premises Oracle database to Amazon Aurora PostgreSQL using AWS DMS. The database has several large tables with hundreds of millions of rows. The migration must complete within a 2-hour downtime window. During the full load, DMS is running slowly on large tables. What should the company do to improve performance?
Disable foreign key constraints on the target during migration.
Why wrong: Not a performance improvement.
Use a smaller DMS instance to avoid network bottlenecks.
Why wrong: Smaller instance is slower.
Set the LOB mode to 'Limited LOB mode' with a high max LOB size.
Why wrong: Does not improve full load speed.
Partition the large tables on the source and target, and use multiple DMS tasks.
Parallelism speeds up loading.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Partition the large tables on the source and target, and use multiple DMS tasks.
Option B is correct because partitioning tables allows parallel loading. Option A is wrong because LOB settings don't affect full load speed. Option C is wrong because disabling foreign keys is not recommended. Option D is wrong because Aurora is not slower.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Disable foreign key constraints on the target during migration.
Why it's wrong here
Not a performance improvement.
Use a smaller DMS instance to avoid network bottlenecks.
Why it's wrong here
Smaller instance is slower.
Set the LOB mode to 'Limited LOB mode' with a high max LOB size.
Why it's wrong here
Does not improve full load speed.
Partition the large tables on the source and target, and use multiple DMS tasks.
Why this is correct
Parallelism speeds up loading.
Related concept
Standard ACLs match source addresses.
Common exam traps
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Real-world example
A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
What to study next
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related SAP-C02 ACL questions on filtering logic and placement.
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FAQ
Accelerate Workload Migration and Modernization — This question tests Accelerate Workload Migration and Modernization — Standard ACLs match source addresses..
The correct answer is: Partition the large tables on the source and target, and use multiple DMS tasks. — Option B is correct because partitioning tables allows parallel loading. Option A is wrong because LOB settings don't affect full load speed. Option C is wrong because disabling foreign keys is not recommended. Option D is wrong because Aurora is not slower.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related SAP-C02 ACL questions on filtering logic and placement.
Standard ACLs match source addresses.
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Last reviewed: Jun 20, 2026
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