01 · Learn
What you will learn
Read an execution plan, find the step responsible for poor performance, and verify one focused improvement.
- Read a plan from the inside out
- Compare estimates with actual work
- Change one cause and measure again
Production Operator · Module
Query plans and performance diagnosis
Read an execution plan, find the step responsible for poor performance, and verify one focused improvement.
Start the first section- Total time
- About 52 minutes
- Learning sections
- 3
- Practice
- Real SQL in a disposable PostgreSQL lab
- Reward
- Shareable module certificate after you pass
02 · Use it
Why this matters
Slow-query fixes are safer when they address measured work instead of a guess.
03 · Practise
What you will do
Read each short section, answer a quick understanding check, then use real SQL to solve a guided task in your own temporary database.
04 · Prove it
How you will finish
Pass the SQL lab and the module assessment. Your result is saved to your signed-in account, and a module certificate is created if you pass.
Before you start
What you should know
- You understand filters, joins, indexes, and query results.