Google PCA Practice Question: Analysing and Optimising Technical and Business Processes
This PCA practice question tests your understanding of analysing and optimising technical and business processes. 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.
An application uses Cloud Bigtable and experiences high latency for reads. The row key is a timestamp prefix followed by a random ID. Queries often scan a range of timestamps for a specific ID. What design change would MOST improve read performance?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Change the row key to start with the random ID followed by timestamp
For Bigtable, row key design is critical. Scanning a range of timestamps for a specific ID is inefficient if the key starts with timestamp (scans across all IDs). Prepending the ID ensures all data for that ID is contiguous, making range scans efficient. Adding nodes increases throughput but doesn't fix the key design issue. Using a column family is about grouping columns, not performance.
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.
✓
Change the row key to start with the random ID followed by timestamp
Why this is correct
This ensures rows for the same ID are clustered together, making timestamp range scans for a specific ID fast.
Related concept
Read the scenario before looking for a memorised answer.
✗
Add more Bigtable nodes
Why it's wrong here
Adding nodes increases throughput but does not improve the latency of individual reads caused by poor row key design.
✗
Use a separate column family for the ID
Why it's wrong here
Column families are for grouping columns; they don't affect row key scanning performance.
✗
Enable Bigtable replication
Why it's wrong here
Replication improves availability and read throughput but does not fix the row key design issue affecting scan performance.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this PCA question in full detail.
Identify which PCA 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.
Analysing and Optimising Technical and Business Processes — This question tests Analysing and Optimising Technical and Business Processes — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Change the row key to start with the random ID followed by timestamp — For Bigtable, row key design is critical. Scanning a range of timestamps for a specific ID is inefficient if the key starts with timestamp (scans across all IDs). Prepending the ID ensures all data for that ID is contiguous, making range scans efficient. Adding nodes increases throughput but doesn't fix the key design issue. Using a column family is about grouping columns, not performance.
What should I do if I get this PCA question wrong?
Identify which PCA 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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