01 · Learn
What you will learn
Choose an index for a real query and explain both its benefit and its cost to writes and storage.
- Match an index to the query
- Choose multicolumn order deliberately
- Measure benefit and cost
Production Operator · Module
Index design and access paths
Choose an index for a real query and explain both its benefit and its cost to writes and storage.
Start the first section- Total time
- About 50 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
A useful index speeds important work; an unnecessary index consumes space and makes every write do more work.
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 can read SELECT, WHERE, JOIN, and ORDER BY clauses.