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Manage a Solution that Can Span Multiple Database Systems →mediumMultiple ChoiceObjective-mapped

PCD Practice Question: Manage a Solution that Can Span Multiple Database Systems

This PCD practice question tests your understanding of manage a solution that can span multiple database systems. 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.

A company wants to migrate an on-premises Oracle database to Cloud SQL for PostgreSQL with minimal downtime. They plan to use Database Migration Service (DMS) with continuous migration. What must be configured on the source Oracle database to enable change data capture (CDC)?

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

✓

Enable supplemental logging

Database Migration Service for Oracle to PostgreSQL requires supplemental logging at the database level to capture all changes for CDC. Without supplemental logging, DMS cannot replicate ongoing changes.

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.

  • ✗

    Set the database to force logging

    Why it's wrong here

    Force logging ensures redo logs are generated, but supplemental logging is the specific requirement for DMS CDC.

  • ✗

    Enable archive log mode

    Why it's wrong here

    Archive log mode is needed for recovery but not specifically for DMS CDC. Supplemental logging is required.

  • ✗

    Configure Oracle GoldenGate

    Why it's wrong here

    GoldenGate is a separate tool; DMS uses its own CDC mechanism, not GoldenGate.

  • ✓

    Enable supplemental logging

    Why this is correct

    Supplemental logging captures the before-and-after values of changed rows, which DMS uses for CDC.

    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.

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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FAQ

Questions learners often ask

What does this PCD question test?

Manage a Solution that Can Span Multiple Database Systems — This question tests Manage a Solution that Can Span Multiple Database Systems — Standard ACLs match source addresses..

What is the correct answer to this question?

The correct answer is: Enable supplemental logging — Database Migration Service for Oracle to PostgreSQL requires supplemental logging at the database level to capture all changes for CDC. Without supplemental logging, DMS cannot replicate ongoing changes.

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

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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.