Start With a Specific Symptom

A slow application needs investigation. Record the affected action, when it occurs, and the conditions under which it becomes slow. Avoid assuming that every issue needs more infrastructure.

Inspect the Query Plan

PostgreSQL’s EXPLAIN command shows the execution plan chosen for a query. Its documentation explains how to read plan output and how EXPLAIN ANALYZE differs by actually executing the statement.

Make Focused Changes

Ask the development team to explain the evidence behind a proposed change and how it will be tested. Compare results using representative data and workloads, and check that behavior remains correct.

Consider Operational Needs

Discuss deployment, backups, monitoring, and the cost of running any additional infrastructure. Capacity should be assessed against the application’s requirements rather than a generic user-count threshold.

Keep a Record

Document the original issue, the change, and the result. That record helps future maintainers understand the decision and gives the team a baseline for later reviews.

Further reading: PostgreSQL’s EXPLAIN documentation.

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