- A
Datastream
Datastream streams change data from Oracle, MySQL, PostgreSQL to BigQuery or GCS in near real-time.
- B
BigQuery Data Transfer Service
Why wrong: Used for scheduled batch imports from SaaS applications like Google Ads, not for real-time CDC.
- C
Pub/Sub
Why wrong: Pub/Sub is a messaging service; it would require additional components to capture CDC from Oracle.
- D
Storage Transfer Service
Why wrong: Used for bulk transfers of files from S3/Azure/internet to GCS, not for CDC from databases.
Question 310 of 1,000
PDE Ingesting and Processing the Data Practice Question
This PDE practice question tests your understanding of ingesting and processing the data. 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.
A company wants to ingest data from an on-premises Oracle database into BigQuery in near real-time with minimal latency. The database has a high volume of inserts and updates. Which service should they use?
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
✓
Datastream
Datastream is designed for CDC from Oracle and other sources to BigQuery or GCS in near real-time.
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.
- ✓
Datastream
Why this is correct
Datastream streams change data from Oracle, MySQL, PostgreSQL to BigQuery or GCS in near real-time.
Related concept
Standard ACLs match source addresses.
- ✗
BigQuery Data Transfer Service
Why it's wrong here
Used for scheduled batch imports from SaaS applications like Google Ads, not for real-time CDC.
- ✗
Pub/Sub
Why it's wrong here
Pub/Sub is a messaging service; it would require additional components to capture CDC from Oracle.
- ✗
Storage Transfer Service
Why it's wrong here
Used for bulk transfers of files from S3/Azure/internet to GCS, not for CDC from databases.
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 PDE ACL questions on filtering logic and placement.
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Ingesting and Processing the Data — study guide chapter
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FAQ
Questions learners often ask
What does this PDE question test?
Ingesting and Processing the Data — This question tests Ingesting and Processing the Data — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Datastream — Datastream is designed for CDC from Oracle and other sources to BigQuery or GCS in near real-time.
What should I do if I get this PDE 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 PDE 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 PDE 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 PDE exam.
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