- A
Use AWS Backup to take a full backup and restore to Amazon RDS.
Why wrong: AWS Backup is a backup service, not a live migration tool.
- B
Use AWS Schema Conversion Tool (SCT) to convert the schema and perform a homogeneous migration.
Why wrong: SCT is for schema conversion, not the live migration service.
- C
Use Amazon Redshift Spectrum to query the data in place.
Why wrong: Redshift is a data warehouse, not suitable for this use case.
- D
Use AWS Database Migration Service (DMS) with ongoing replication.
DMS supports heterogeneous migrations and minimizes downtime.
Question 509 of 1,733
Minimizing Downtime with AWS Database Migration Service (CDC)
This PAS-C01 practice question tests your understanding of 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 monolithic application to AWS. The application has a relational database with complex queries and requires low-latency read replicas. Which database migration strategy minimizes downtime and supports heterogeneous migrations?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use AWS Database Migration Service (DMS) with ongoing replication.
Option D is correct because AWS Database Migration Service (DMS) supports heterogeneous migrations (e.g., from Oracle to Amazon Aurora) and can minimize downtime by using ongoing replication to keep the source and target synchronized during the migration. Option A is incorrect because AWS Backup is a backup/restore service, not a live migration tool, and typically requires downtime. Option B is incorrect because AWS Schema Conversion Tool (SCT) is used for schema conversion, not for the actual data migration; it is often used alongside DMS. Option C is incorrect because Amazon Redshift Spectrum is for querying data in Amazon S3, not for database migration.
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
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use AWS Backup to take a full backup and restore to Amazon RDS.
Why it's wrong here
AWS Backup is a backup service, not a live migration tool.
- ✗
Use AWS Schema Conversion Tool (SCT) to convert the schema and perform a homogeneous migration.
Why it's wrong here
SCT is for schema conversion, not the live migration service.
- ✗
Use Amazon Redshift Spectrum to query the data in place.
Why it's wrong here
Redshift is a data warehouse, not suitable for this use case.
- ✓
Use AWS Database Migration Service (DMS) with ongoing replication.
Why this is correct
DMS supports heterogeneous migrations and minimizes downtime.
Related concept
Standard ACLs match source addresses.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
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.
KKey Concepts to Remember
- Standard ACLs match source addresses.
- Extended ACLs can match source, destination, protocol and ports.
- The first matching ACL entry is used.
- There is usually an implicit deny at the end.
TExam Day Tips
- Check inbound versus outbound direction.
- Read the ACL from top to bottom.
- Look for a broader permit or deny above the intended line.
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
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.
Visual reference
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
What to study next
Got this wrong? Here's your next step.
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 PAS-C01 ACL questions on filtering logic and placement.
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FAQ
Questions learners often ask
What does this PAS-C01 question test?
Migration — This question tests Migration — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Use AWS Database Migration Service (DMS) with ongoing replication. — Option D is correct because AWS Database Migration Service (DMS) supports heterogeneous migrations (e.g., from Oracle to Amazon Aurora) and can minimize downtime by using ongoing replication to keep the source and target synchronized during the migration. Option A is incorrect because AWS Backup is a backup/restore service, not a live migration tool, and typically requires downtime. Option B is incorrect because AWS Schema Conversion Tool (SCT) is used for schema conversion, not for the actual data migration; it is often used alongside DMS. Option C is incorrect because Amazon Redshift Spectrum is for querying data in Amazon S3, not for database migration.
What should I do if I get this PAS-C01 question wrong?
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 PAS-C01 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Same concept, more angles
3 more ways this is tested on PAS-C01
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company is migrating a custom CRM application to AWS. The application uses a PostgreSQL database. Which migration approach minimizes downtime?
easy- ✓ A.Use AWS Database Migration Service (DMS) with ongoing replication (CDC).
- B.Use AWS Backup to create a snapshot and restore to RDS.
- C.Take a full backup of the source database, restore to RDS for PostgreSQL, and then cut over.
- D.Use pg_dump to export the database and pg_restore to import into RDS.
Why A: Option A is correct because AWS Database Migration Service (DMS) with ongoing change data capture (CDC) enables near-zero downtime migration by continuously replicating changes from the source to the target until cutover. Options B, C, and D all require taking the source database offline for backup or export, resulting in significant downtime.
Variation 2. A company is moving their SAP Business One application from an on-premises data center to AWS. The application runs on Windows Server and uses Microsoft SQL Server. They want to use Amazon EC2 for the application and Amazon RDS for SQL Server for the database. They have already used AWS SCT to assess the database schema and found that it is compatible. What should they do next to migrate the database with minimal downtime?
easy- A.Export the database to flat files and upload to S3, then import into RDS
- B.Use AWS SCT to convert the schema and then use AWS DMS
- ✓ C.Use AWS DMS to perform a full load and then enable ongoing replication
- D.Take a full backup of the on-premises SQL Server, upload it to Amazon S3, and restore to RDS
Why C: Option C is correct because AWS DMS can perform a full load and then enable ongoing replication to minimize downtime during migration. Option A is wrong because manual export/import requires downtime. Option B is wrong because the schema is already compatible, so using SCT first is unnecessary; DMS can be used directly. Option D is wrong because copying a backup to S3 and restoring to RDS requires downtime during the restore.
Variation 3. A company is migrating a legacy on-premises application to AWS. The application uses a MySQL database with a complex stored procedure that runs every hour and takes approximately 10 minutes to complete. The company wants to minimize downtime during migration. Which TWO approaches should the company use to migrate the database?
medium- A.Use AWS DMS with a full load only, without ongoing replication, and schedule a cutover window.
- ✓ B.Use AWS Database Migration Service (DMS) with ongoing replication from the source MySQL database to an Amazon RDS for MySQL instance.
- ✓ C.Set up an Amazon Aurora MySQL DB cluster and use AWS DMS with the on-premises MySQL database as the source and the Aurora cluster as the target, enabling ongoing replication.
- D.Take a full database dump using mysqldump and import it into an Amazon RDS for MySQL instance during a planned maintenance window.
- E.Create an Amazon RDS for MySQL read replica from the on-premises database.
Why B: Option B is correct because AWS DMS with ongoing replication allows continuous synchronization from the source MySQL database to Amazon RDS for MySQL, minimizing downtime during migration. The complex stored procedure that runs hourly and takes 10 minutes is handled seamlessly as DMS captures ongoing changes, enabling a controlled cutover with minimal disruption.
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Last reviewed: Jun 20, 2026
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