- A
Convert RAW to VARCHAR2 before migration using a trigger.
Why wrong: VARCHAR2 is not suitable for binary data.
- B
Raw data type is not supported by DMS; you must drop the column and re-add as BYTEA after migration.
Why wrong: DMS supports RAW to BYTEA mapping; it should work.
- C
Verify DMS supports RAW to BYTEA mapping; if not, use a manual export/import for that table.
DMS does support this mapping, but if it fails, manual intervention may be needed.
- D
Use Cloud Dataflow to transform the data as it streams.
Why wrong: Dataflow is not directly integrated with DMS for ongoing replication.
Question 539 of 980
PCD Migrate Data Solutions Practice Question
This PCD practice question tests your understanding of migrate data solutions. 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.
During an Oracle to PostgreSQL migration using Database Migration Service (DMS), the continuous replication fails with an error about unsupported data types. The source table uses Oracle's RAW data type. How should this be handled?
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
✓
Verify DMS supports RAW to BYTEA mapping; if not, use a manual export/import for that table.
Oracle RAW type maps to PostgreSQL BYTEA. DMS should handle this conversion automatically. If it fails, it may be due to version incompatibility or configuration. The correct action is to check DMS logs and ensure the mapping is correct; if DMS cannot handle it, a manual workaround is to convert RAW to BYTEA using a custom script.
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.
- ✗
Convert RAW to VARCHAR2 before migration using a trigger.
Why it's wrong here
VARCHAR2 is not suitable for binary data.
- ✗
Raw data type is not supported by DMS; you must drop the column and re-add as BYTEA after migration.
Why it's wrong here
DMS supports RAW to BYTEA mapping; it should work.
- ✓
Verify DMS supports RAW to BYTEA mapping; if not, use a manual export/import for that table.
Why this is correct
DMS does support this mapping, but if it fails, manual intervention may be needed.
Related concept
Standard ACLs match source addresses.
- ✗
Use Cloud Dataflow to transform the data as it streams.
Why it's wrong here
Dataflow is not directly integrated with DMS for ongoing replication.
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 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. 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. 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 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 PCD ACL questions on filtering logic and placement.
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Migrate Data Solutions — study guide chapter
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FAQ
Questions learners often ask
What does this PCD question test?
Migrate Data Solutions — This question tests Migrate Data Solutions — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Verify DMS supports RAW to BYTEA mapping; if not, use a manual export/import for that table. — Oracle RAW type maps to PostgreSQL BYTEA. DMS should handle this conversion automatically. If it fails, it may be due to version incompatibility or configuration. The correct action is to check DMS logs and ensure the mapping is correct; if DMS cannot handle it, a manual workaround is to convert RAW to BYTEA using a custom script.
What should I do if I get this PCD 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 PCD ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Last reviewed: Jul 4, 2026
This PCD practice question is part of Courseiva's free Google Cloud certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PCD exam.
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