Question 734 of 1,446
Manage a solution that can span multiple database technologies →mediumMultiple SelectObjective-mapped
PCDE Practice Question: Manage a solution that can span multiple database technologies
Which TWO statements about Cloud Spanner schema changes are correct? (Choose 2)
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
✓
Schema changes are applied asynchronously and may take minutes to hours to complete.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Schema changes are applied asynchronously and may take minutes to hours to complete.
Why this is correct
Schema changes are applied in the background and can take time depending on data size.
- ✗
Schema changes require the instance to be restarted.
Why it's wrong here
No restart needed.
- ✓
ALTER TABLE statements are non-blocking and can be executed while the database is in use.
Why this is correct
Spanner supports online schema changes.
- ✗
You can only add columns, not drop them.
Why it's wrong here
Spanner supports dropping columns.
- ✗
Creating a secondary index requires taking the table offline.
Why it's wrong here
Index creation is online and non-blocking.
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Last reviewed: Jul 4, 2026
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.
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