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1. 1. What does WP_DEBUG enable?

   What does WP_DEBUG enable?

   User authorization Automatic repairs Development notices, warnings and WordPress debug behavior Database caching
   Hint

   Choose the answer that reflects current WordPress engineering practice.

2. 2. What does WP_DEBUG_LOG do when debugging is enabled?

   What does WP_DEBUG_LOG do when debugging is enabled?

   Writes errors to a configured debug log Fixes exceptions Stores logs as posts Emails every visitor
   Hint

   Choose the answer that reflects current WordPress engineering practice.

3. 3. Why is WP_DEBUG_DISPLAY usually disabled on production?

   Why is WP_DEBUG_DISPLAY usually disabled on production?

   It deletes logs It blocks administrators It disables PHP Error details may expose sensitive implementation information
   Hint

   Choose the answer that reflects current WordPress engineering practice.

4. 4. What does SCRIPT_DEBUG help test?

   What does SCRIPT_DEBUG help test?

   Unminified development versions of core scripts and styles SQL permissions Cron timing Media uploads
   Hint

   Choose the answer that reflects current WordPress engineering practice.

5. 5. What does SAVEQUERIES record?

   What does SAVEQUERIES record?

   HTTP requests only SQL text, execution time and caller information Theme files User passwords
   Hint

   Choose the answer that reflects current WordPress engineering practice.

6. 6. Why should SAVEQUERIES not remain enabled casually?

   Why should SAVEQUERIES not remain enabled casually?

   Collecting every query has a performance and memory cost It changes permalinks It disables SQL It logs out users
   Hint

   Choose the answer that reflects current WordPress engineering practice.

7. 7. What should happen before optimizing a slow page?

   What should happen before optimizing a slow page?

   Increase every cache lifetime Disable security Rewrite every plugin Measure and identify the actual bottleneck
   Hint

   Choose the answer that reflects current WordPress engineering practice.

8. 8. Why is total query count alone insufficient?

   Why is total query count alone insufficient?

   SQL is never a bottleneck Every query costs the same A few slow queries may matter more than many fast cached ones Counts cannot be measured
   Hint

   Choose the answer that reflects current WordPress engineering practice.

9. 9. What is an N+1 query problem?

   What is an N+1 query problem?

   A loop triggers an extra query for each item A query returns null One query has one condition Cron runs twice
   Hint

   Choose the answer that reflects current WordPress engineering practice.

10. 10. What can a persistent object cache reduce?

    What can a persistent object cache reduce?

    PHP syntax errors HTTP authorization Repeated database work across requests Image dimensions
    Hint

    Choose the answer that reflects current WordPress engineering practice.

11. 11. What does full-page caching avoid?

    What does full-page caching avoid?

    Plugin updates Database backups Repeating most WordPress generation for cacheable responses DNS resolution everywhere
    Hint

    Choose the answer that reflects current WordPress engineering practice.

12. 12. Why is cache invalidation important?

    Why is cache invalidation important?

    Caches never expire Cached results must change when source data changes It reduces CSS specificity It grants permissions
    Hint

    Choose the answer that reflects current WordPress engineering practice.

13. 13. What must code do after a transient cache miss?

    What must code do after a transient cache miss?

    Delete WordPress Regenerate the value safely and store it again Throw a fatal error Assume empty data is correct
    Hint

    Choose the answer that reflects current WordPress engineering practice.

14. 14. What should be inspected when autoloaded options are large?

    What should be inspected when autoloaded options are large?

    Which values are large, stale or not required on most requests CSS classes User avatars Only post titles
    Hint

    Choose the answer that reflects current WordPress engineering practice.

15. 15. How can frontend asset cost be reduced?

    How can frontend asset cost be reduced?

    Inline every library everywhere Disable browser caching Load only needed assets and optimize their size and dependencies Duplicate scripts
    Hint

    Choose the answer that reflects current WordPress engineering practice.

16. 16. What is a basic image-performance practice?

    What is a basic image-performance practice?

    Convert images to SQL Disable alt text Serve appropriately sized compressed images Always serve originals
    Hint

    Choose the answer that reflects current WordPress engineering practice.

17. 17. Why write reliable reproduction steps?

    Why write reliable reproduction steps?

    They change the database They replace logs They hide failures They isolate conditions and make fixes verifiable
    Hint

    Choose the answer that reflects current WordPress engineering practice.

18. 18. What does disabling components one at a time help determine?

    What does disabling components one at a time help determine?

    PHP syntax automatically DNS ownership The user password Whether a plugin or theme interaction causes the issue
    Hint

    Choose the answer that reflects current WordPress engineering practice.

19. 19. What is a safe production-debugging principle?

    What is a safe production-debugging principle?

    Edit core live Delete caches and data together Collect minimal targeted evidence without displaying secrets or errors publicly Enable every verbose flag indefinitely
    Hint

    Choose the answer that reflects current WordPress engineering practice.

20. 20. What completes a debugging cycle after implementing a fix?

    What completes a debugging cycle after implementing a fix?

    Rename the plugin Increase memory without testing Reproduce the original case, verify the fix and check regressions Delete the logs only
    Hint

    Choose the answer that reflects current WordPress engineering practice.