Loading demo links...
Showing 1–12 of 12 questions
What does EXPLAIN ANALYZE show for tuning?
Select an option, then click Submit answer.
Which statistics must be current for good plans?
Select an option, then click Submit answer.
Which join suits large unsorted table pairs?
Select an option, then click Submit answer.
What does a B-tree index accelerate most?
Select an option, then click Submit answer.
Which parameter sizes the query work memory?
Select an option, then click Submit answer.
What problem does VACUUM solve for performance?
Select an option, then click Submit answer.
Which two actions commonly improve query speed? (Choose two.)
Select all that apply, then click Submit answer.
Which two does WDR reporting compare? (Choose two.)
Select all that apply, then click Submit answer.
Which two reduce sort operation costs? (Choose two.)
Select all that apply, then click Submit answer.
DRAG DROP
Match each optimization signal to its remedy.
Items to match: Full table scan, External sort spill, Stale statistics warning, Skewed join distribution.
Answer is in the explanation below.
CORRECT TEXT
The openGauss report that compares two performance snapshots for diagnosis is called ______.
Answer is in the explanation below.
DRAG DROP
Match each lock mode to its typical holder.
Items to match: AccessShareLock mode, RowExclusiveLock mode, AccessExclusiveLock mode, ShareLock mode.
Answer is in the explanation below.
