- A
Oracle CLOB → PostgreSQL TEXT
Correct mapping for large character objects.
- B
Oracle VARCHAR2(100) → PostgreSQL CHAR(100)
Why wrong: VARCHAR2 maps to VARCHAR, not CHAR (fixed-length).
- C
Oracle NUMBER(10,2) → PostgreSQL INTEGER
Why wrong: Should be NUMERIC(10,2) to preserve decimal places.
- D
Oracle NUMBER(10) → PostgreSQL INTEGER
Correct mapping for a 10-digit integer without decimal.
- E
Oracle DATE → PostgreSQL DATE
Why wrong: Oracle DATE includes time, so it should map to TIMESTAMP.
Question 624 of 1,000
PCDOE Migrate Database Solutions Practice Question
This PCDOE practice question tests your understanding of migrate database 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.
Which TWO data type mappings are correct when converting Oracle data types to PostgreSQL?
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
✓
Oracle CLOB → PostgreSQL TEXT
Option A is correct because Oracle's CLOB (Character Large Object) stores large variable-length character data, and PostgreSQL's TEXT type is the direct equivalent, supporting up to 1 GB of character data without the length limitations of VARCHAR(n). Both handle large strings efficiently, making this a standard mapping in database migrations.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Oracle CLOB → PostgreSQL TEXT
Why this is correct
Correct mapping for large character objects.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Oracle VARCHAR2(100) → PostgreSQL CHAR(100)
Why it's wrong here
VARCHAR2 maps to VARCHAR, not CHAR (fixed-length).
- ✗
Oracle NUMBER(10,2) → PostgreSQL INTEGER
Why it's wrong here
Should be NUMERIC(10,2) to preserve decimal places.
- ✓
Oracle NUMBER(10) → PostgreSQL INTEGER
Why this is correct
Correct mapping for a 10-digit integer without decimal.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Oracle DATE → PostgreSQL DATE
Why it's wrong here
Oracle DATE includes time, so it should map to TIMESTAMP.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that Oracle's DATE and PostgreSQL's DATE are equivalent, when in fact Oracle's DATE includes time components, and candidates may overlook the need to map to TIMESTAMP.
Detailed technical explanation
How to think about this question
Under the hood, Oracle's DATE type is stored as a fixed 7-byte field containing century, year, month, day, hour, minute, and second, whereas PostgreSQL's DATE is a 4-byte integer representing days since 2000-01-01. In real-world migrations, failing to map Oracle DATE to PostgreSQL TIMESTAMP can cause silent truncation of time data, leading to application logic errors in time-sensitive systems like financial transactions or logging.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
- →
Migrate Database Solutions — study guide chapter
Learn the concepts, then practise the questions
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FAQ
Questions learners often ask
What does this PCDOE question test?
Migrate Database Solutions — This question tests Migrate Database Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Oracle CLOB → PostgreSQL TEXT — Option A is correct because Oracle's CLOB (Character Large Object) stores large variable-length character data, and PostgreSQL's TEXT type is the direct equivalent, supporting up to 1 GB of character data without the length limitations of VARCHAR(n). Both handle large strings efficiently, making this a standard mapping in database migrations.
What should I do if I get this PCDOE question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: Jul 4, 2026
This PCDOE 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 PCDOE exam.
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