DBS-C01 Deployment and Migration Practice Question
This DBS-C01 practice question tests your understanding of deployment and migration. 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 a 1 TB Oracle database to Amazon Aurora PostgreSQL using AWS DMS. They need to ensure minimal downtime and data consistency. Which TWO actions should the company take?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable change data capture (CDC) on the source Oracle database
Option B is correct because enabling Change Data Capture (CDC) on the source Oracle database allows AWS DMS to capture ongoing changes after the full load, enabling a near-zero downtime migration by continuously replicating transactions to the target Aurora PostgreSQL. Option C is correct because enabling data validation on the DMS task ensures that the data migrated is consistent between the source and target, verifying that no data loss or corruption occurred during the migration process.
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.
✗
Increase the target Aurora storage to 2 TB to avoid storage issues
Why it's wrong here
Storage size is not directly related to minimal downtime or consistency.
✓
Enable change data capture (CDC) on the source Oracle database
Why this is correct
CDC captures ongoing changes to minimize downtime.
Related concept
Read the scenario before looking for a memorised answer.
✓
Enable data validation on the DMS task
Why this is correct
Validation ensures data consistency.
Related concept
Read the scenario before looking for a memorised answer.
✗
Disable foreign key constraints on the target during migration
Why it's wrong here
May be helpful but not mandatory; not a required action for all migrations.
✗
Use AWS Schema Conversion Tool to convert the schema
Why it's wrong here
SCT is for schema conversion before migration, not during migration.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the AWS Schema Conversion Tool (SCT) with DMS, thinking it is part of the migration process for minimizing downtime, when in fact SCT is used for schema assessment and conversion before migration, not for ongoing replication or consistency checks.
Detailed technical explanation
How to think about this question
AWS DMS CDC uses Oracle's LogMiner or binary reader to read redo logs and capture committed transactions, applying them to the target in near real-time. Data validation in DMS performs a checksum comparison of rows between source and target after the full load and during CDC, using a hash-based algorithm that can be resource-intensive but ensures consistency. In practice, CDC requires the source database to be in ARCHIVELOG mode with supplemental logging enabled, and DMS validates data by comparing primary key or unique index values, which can impact performance on large tables.
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: Enable change data capture (CDC) on the source Oracle database — Option B is correct because enabling Change Data Capture (CDC) on the source Oracle database allows AWS DMS to capture ongoing changes after the full load, enabling a near-zero downtime migration by continuously replicating transactions to the target Aurora PostgreSQL. Option C is correct because enabling data validation on the DMS task ensures that the data migrated is consistent between the source and target, verifying that no data loss or corruption occurred during the migration process.
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.
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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