How can I improve PostgreSQL performance without guessing?

Question

A performance change should improve the measured workload without sacrificing correctness or wasting capacity. Which measurements and bottlenecks should be considered first?

Tasadduq Burney · Accepted Answer

Use EXPLAIN and, in a safe environment, EXPLAIN ANALYZE with representative parameters. Examine indexes, row estimates, I/O and sort behavior. EXPLAIN ANALYZE executes the statement, so treat writes carefully. Connection pooling and query design often matter more than increasing CPU alone.

How can I improve PostgreSQL performance without guessing?

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