What should I check first when PostgreSQL fails?

Question

A failure needs to be narrowed down before settings are changed or operations retried. Which evidence best separates application errors from environment and dependency problems?

Tasadduq Burney · Accepted Answer

Check the database logs, connection limits, locks and the exact SQL error. A waiting query may be blocked by another transaction rather than inherently slow. Inspect transaction age and blocking relationships before terminating sessions, since an indiscriminate kill can trigger expensive rollbacks.

What should I check first when PostgreSQL fails?

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Your perspective belongs here.

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