The answer is database size and network bandwidth, along with required downtime tolerance. These two factors are critical because they directly determine whether an online (minimal downtime, continuous replication) or offline (full data dump with extended outage) migration method is feasible for moving from on-premises Oracle to Amazon RDS for Oracle. Database size and network bandwidth dictate the total transfer time and whether a one-time bulk load can complete within a maintenance window, while downtime tolerance decides if you can afford the cutover delay of an offline approach or must use AWS Database Migration Service for near-zero downtime. On the AWS Certified Database Specialty DBS-C01 exam, this question tests your understanding of migration planning trade-offs; a common trap is assuming feature compatibility matters, but RDS for Oracle supports most Oracle features, so that is not a limiting factor. Remember the mnemonic “Size and Speed, then Downtime Need” to recall that bandwidth and database volume drive the method, and tolerance for interruption seals the choice.
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.
Which TWO factors should be considered when selecting a migration method from on-premises Oracle to Amazon RDS for Oracle?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The size of the database and available network bandwidth
Correct: B (database size and network bandwidth determine the best approach) and D (downtime tolerance affects choice between online and offline migration). A is not a factor because RDS supports Oracle features; C is irrelevant; E is not a primary factor.
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.
✓
The size of the database and available network bandwidth
Why this is correct
Large databases may require Snowball; bandwidth affects transfer time.
Related concept
Standard ACLs match source addresses.
✗
The version of the Oracle client used by applications
Why it's wrong here
Client version is usually compatible.
✓
The required downtime tolerance
Why this is correct
Minimal downtime requires CDC; offline is simpler but longer downtime.
Related concept
Standard ACLs match source addresses.
✗
The number of stored procedures in the database
Why it's wrong here
Stored procedures are typically supported; not a major factor.
✗
The number of indexes on the source database
Why it's wrong here
Indexes are migrated automatically; not a key factor.
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 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
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 DBS-C01 ACL questions on filtering logic and placement.
Deployment and Migration — This question tests Deployment and Migration — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: The size of the database and available network bandwidth — Correct: B (database size and network bandwidth determine the best approach) and D (downtime tolerance affects choice between online and offline migration). A is not a factor because RDS supports Oracle features; C is irrelevant; E is not a primary factor.
What should I do if I get this DBS-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 DBS-C01 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Question Discussion
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