advanced~2h
Production Monitoring: Wait Events & Lock Contention
The real story behind "why is this query slow right now" — database health reporting, wait events, and how to diagnose lock contention while it's actively happening.
Learning objectives
- Explain what a database health report tracks and why it matters even when the specific tool differs by vendor
- Define a wait event and explain why most slow queries are actually spent waiting, not computing
- Diagnose a blocking-session scenario and identify which session is holding a lock another session needs
- Distinguish a deadlock from ordinary lock waiting
- Connect historical reporting (what happened) to real-time monitoring (what's happening now) as two complementary tools
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Production Monitoring: Wait Events & Lock Contention