PostgreSQL - Performance Tuning
What does a
sequential scan do in PostgreSQL?What does a sequential scan do in PostgreSQL?
easy📝 Conceptual Q11 of 15
Step-by-Step Solution
Solution:
Step 1: Understand sequential scan behavior
A sequential scan reads all rows in the table from start to end without using any index.Step 2: Compare with other options
Using an index is an index scan, reading only first 10 rows or deleting rows are unrelated actions.Final Answer:
Reads every row in the table one by one -> Option DQuick Check:
Sequential scan = full table read [OK]
Quick Trick: Sequential scan reads all rows, no index used [OK]
Common Mistakes:
- Confusing sequential scan with index scan
- Thinking sequential scan reads only some rows
- Assuming sequential scan deletes rows
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