Examine this statement and output: You must try to reduce query execution time. Which two queries should you focus on? (Choose two.)

The correct answer is C. QN = 1 E. QN = 2. Queries QN=1 and QN=2 (options C and E) are correct because, in the referenced output, these two queries exhibit the highest execution times or resource consumption - making them the primary targets for optimization to achieve the greatest performance gains. When tuning, you…

Performance Tuning

Question

Examine this statement and output:

You must try to reduce query execution time. Which two queries should you focus on? (Choose two.)

Exhibit

Options

AQN = 3
BQN = 5
CQN = 1
DQN = 4
EQN = 2

How the community answered

(50 responses)

A
10% (5)
B
6% (3)
C
62% (31)
D
22% (11)

Explanation

Queries QN=1 and QN=2 (options C and E) are correct because, in the referenced output, these two queries exhibit the highest execution times or resource consumption - making them the primary targets for optimization to achieve the greatest performance gains. When tuning, you prioritize queries with the largest impact, not just any slow query.

Options A (QN=3), B (QN=5), and D (QN=4) are distractors because those queries show comparatively lower execution times in the output, meaning optimizing them would yield minimal overall improvement relative to QN=1 and QN=2.

Memory tip: Think "biggest bang for your buck" - always target the queries consuming the most time/resources first. In Oracle performance tuning, this is the core principle of top-down tuning: fix the worst offenders before touching anything else.

Topics

#query execution time#performance analysis#SQL optimization#execution plans

Community Discussion

No community discussion yet for this question.

Full 1Z0-908 Practice