Design innovative, scalable, and highly available cloud database solutions →easyMultiple ChoiceObjective-mapped
PCDE Practice Question: Design innovative, scalable, and highly available cloud database solutions
Which of the following is a benefit of using parent-child interleaved tables in Cloud Spanner?
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
✓
Improved read performance for queries joining parent and child
Interleaving stores child rows physically close to their parent row, enabling fast joins and reducing read latency. It does not improve write throughput or eliminate the need for secondary indexes.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Improved read performance for queries joining parent and child
Why this is correct
Co-locating rows reduces the need for distributed reads.
- ✗
Increased write throughput by distributing writes
Why it's wrong here
Interleaving does not affect write throughput distribution.
- ✗
Automatic sharding across regions
Why it's wrong here
Sharding is controlled by primary key design, not interleaving.
- ✗
Eliminates the need for secondary indexes
Why it's wrong here
Secondary indexes are still needed for other access patterns.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This PCDE 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 PCDE exam.