PostgreSQL - Performance Tuning
In the EXPLAIN output, what does the term
Seq Scan indicate?In the EXPLAIN output, what does the term Seq Scan indicate?
easy📝 Conceptual Q2 of 15
Step-by-Step Solution
Solution:
Step 1: Identify what Seq Scan means
Seq Scan means scanning every row in the table one by one.Step 2: Differentiate from other scan types
Index scans use indexes, joins combine tables, sorting orders data.Final Answer:
A sequential scan of the entire table -> Option CQuick Check:
Seq Scan = Full table scan [OK]
Quick Trick: Seq Scan means reading all rows in order [OK]
Common Mistakes:
- Confusing Seq Scan with Index Scan
- Thinking Seq Scan is a join
- Assuming Seq Scan sorts data
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