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Advanced About 30 min
EXPLAIN & Query Performance
Read query plans, spot sequential scans, add indexes, and turn slow queries into fast ones.
What you'll learn
- Read EXPLAIN output to understand query execution plans
- Distinguish Seq Scan, Index Scan, and Bitmap Scan
- Use EXPLAIN ANALYZE to see actual execution times
- Identify join strategies: Nested Loop, Hash Join, Merge Join
- Compare query approaches to find the most efficient one