- A
Remove all sequences and use UUIDs generated by the application.
Why wrong: While possible, this is a significant redesign and not a direct conversion of sequences; the question asks for valid approaches to handle sequences, not to replace them.
- B
Replace Oracle sequences with PostgreSQL SERIAL columns.
SERIAL is a PostgreSQL feature that creates an auto-incrementing integer column, similar to Oracle sequences used for primary keys.
- C
Use PostgreSQL's IDENTITY columns (GENERATED AS IDENTITY).
IDENTITY columns are the SQL standard way to auto-generate primary keys, supported in PostgreSQL 10+.
- D
Create PostgreSQL sequences and use nextval() in INSERT statements.
PostgreSQL sequences can emulate Oracle sequences directly, with nextval() and currval() functions.
- E
Use Oracle sequences directly in PostgreSQL via a compatibility layer.
Why wrong: PostgreSQL does not support Oracle sequences natively; a compatibility layer would be complex and not recommended.
PCD Migrate Data Solutions Practice Question
This PCD practice question tests your understanding of migrate data solutions. 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.
An organization is migrating a large Oracle database to Cloud SQL for PostgreSQL. They need to handle Oracle's SEQUENCE objects, which are used for primary key generation. Which THREE approaches are valid for this migration?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"primary"Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
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
Replace Oracle sequences with PostgreSQL SERIAL columns.
PostgreSQL has SERIAL, sequences, and IDENTITY columns. Oracle sequences can be converted to PostgreSQL sequences or IDENTITY columns. SERIAL is a shorthand for creating a sequence on a column.
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.
- ✗
Remove all sequences and use UUIDs generated by the application.
Why it's wrong here
While possible, this is a significant redesign and not a direct conversion of sequences; the question asks for valid approaches to handle sequences, not to replace them.
- ✓
Replace Oracle sequences with PostgreSQL SERIAL columns.
Why this is correct
SERIAL is a PostgreSQL feature that creates an auto-incrementing integer column, similar to Oracle sequences used for primary keys.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
- ✓
Use PostgreSQL's IDENTITY columns (GENERATED AS IDENTITY).
Why this is correct
IDENTITY columns are the SQL standard way to auto-generate primary keys, supported in PostgreSQL 10+.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
- ✓
Create PostgreSQL sequences and use nextval() in INSERT statements.
Why this is correct
PostgreSQL sequences can emulate Oracle sequences directly, with nextval() and currval() functions.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
- ✗
Use Oracle sequences directly in PostgreSQL via a compatibility layer.
Why it's wrong here
PostgreSQL does not support Oracle sequences natively; a compatibility layer would be complex and not recommended.
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.
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: Replace Oracle sequences with PostgreSQL SERIAL columns. — PostgreSQL has SERIAL, sequences, and IDENTITY columns. Oracle sequences can be converted to PostgreSQL sequences or IDENTITY columns. SERIAL is a shorthand for creating a sequence on a column.
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.
Are there clue words in this question I should notice?
Yes — watch for: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
What is the key concept behind this question?
Standard ACLs match source addresses.
About these practice questions
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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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