01 · Learn
What you will learn
Find blocking transactions, choose a safe response, and explain how consistent lock ordering prevents deadlocks.
- Understand why transactions hold locks
- Trace the blocking chain
- Prevent repeat deadlocks
Production Operator · Module
Transactions, locks, and deadlocks
Find blocking transactions, choose a safe response, and explain how consistent lock ordering prevents deadlocks.
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
Lock incidents affect users quickly, but terminating the wrong session can lose important 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 understand transactions and can read pg_stat_activity.