The answer is to partition the table by a key that spreads write load. This schema design change directly reduces lock contention in Cloud SQL PostgreSQL because partitioning splits a single large table into smaller physical segments, or partitions, so concurrent writes targeting different partitions operate on separate locks rather than contending for a single table-level lock. On the Google Professional Cloud Database Engineer exam, this concept tests your understanding of how PostgreSQL’s native declarative partitioning mitigates write bottlenecks under heavy DML—a common scenario in high-throughput transactional workloads. A frequent trap is confusing read scaling solutions, like read replicas, with write-side fixes; remember that replicas only offload SELECT queries and do nothing for write lock contention. Another pitfall is assuming connection pooling or materialized views address locking, but they manage connections or precompute reads, not write conflicts. Memory tip: think “split the table, split the lock”—partitioning by a high-cardinality column, such as customer_id or date, ensures writes are distributed across partitions, minimizing lock waits and improving concurrency.
PCDE Design and implement database schemas Practice Question
This PCDE practice question tests your understanding of design and implement database schemas. 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 Cloud SQL for PostgreSQL database experiences lock contention during heavy concurrent writes on a single table. Which schema design change can most effectively reduce contention?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Partition the table by a key that spreads write load
Option C is correct: table partitioning splits data into smaller physical pieces, reducing lock conflicts because writes target different partitions. Option A (read replicas) does not reduce write contention. Option B (connection pooling) improves connection management but not locking. Option D (materialized views) does not affect write locking.
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.
✗
Deploy read replicas to offload reads
Why it's wrong here
Read replicas help with read scalability, not write contention.
✗
Use a connection pooler like PgBouncer
Why it's wrong here
Connection pooling does not reduce locks on the table.
✗
Create materialized views for read queries
Why it's wrong here
Materialized views are for read optimization, not write contention.
✓
Partition the table by a key that spreads write load
Why this is correct
Partitioning reduces lock contention by distributing writes.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 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. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. 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.
Identify which PCDE exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Design and implement database schemas — This question tests Design and implement database schemas — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Partition the table by a key that spreads write load — Option C is correct: table partitioning splits data into smaller physical pieces, reducing lock conflicts because writes target different partitions. Option A (read replicas) does not reduce write contention. Option B (connection pooling) improves connection management but not locking. Option D (materialized views) does not affect write locking.
What should I do if I get this PCDE question wrong?
Identify which PCDE exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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