Comparison Guide

AWS RDS Performance Insights vs MonPG for RDS PostgreSQL

If you run PostgreSQL on RDS, Performance Insights is already there: database load by wait event, top SQL, seven days of history at no charge. It is a genuinely useful first responder, and AWS is folding it into CloudWatch Database Insights. The gap appears the day an incident is older than your retention window, or the moment 'top SQL by load' needs to become 'which exact query regressed after Tuesday's deploy, and what do we do about it'.

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Strongest fit

  • You need history beyond the free 7-day window without per-vCPU retention pricing - last month's baseline is what makes this week's regression visible.
  • Wait events tell you the database is busy; you need query-normalized statistics, plan context, and lock chains to know why.
  • You want regression alerting with before/after comparison, not a dashboard you have to be watching at the right moment.
  • You also run PostgreSQL outside RDS (Aurora, Azure, GCP, self-hosted) and want one monitoring surface across all of it.

Not ideal when

  • You want zero setup and zero additional cost - Performance Insights is enabled with a checkbox and the 7-day tier is free; nothing external competes with that.
  • Wait-event analysis at the instance level is genuinely your main need; PI's load-by-waits view is well done and natively correlated with CloudWatch.
  • Your org standardizes hard on AWS-native tooling and IAM-scoped access for everything.

Decision signals to evaluate

Retention: PI's free tier keeps 7 days (longer retention is paid, per vCPU); MonPG keeps the trend history that regression detection actually needs.
Granularity of attribution: PI shows top SQL by load; MonPG tracks per-query-fingerprint statistics over time, so a single query family's drift is a first-class object.
Actionability: PI describes load; MonPG carries you to plan analysis and index rollout risk on the same surface.
Platform churn: AWS is transitioning Performance Insights into CloudWatch Database Insights (with the PI dashboard retiring mid-2026), so the tool you adopt today is mid-migration - factor that in.
Cross-cloud: PI exists only for RDS/Aurora; MonPG covers RDS, Aurora, Azure, Cloud SQL, and self-hosted from one place.
Alerting: PI relies on you to look (or on CloudWatch alarms you assemble); MonPG ships database-aware alerts out of the box.

Related PostgreSQL pages

AWS RDS Monitoring

Full guide to monitoring PostgreSQL on RDS.

Aurora PostgreSQL Monitoring

Aurora-specific monitoring considerations.

PostgreSQL Slow Query Monitoring

Regression detection beyond a 7-day window.

FAQ

Performance Insights is free - why add anything?

Keep it enabled; it costs nothing and the wait-event view is useful. Teams add MonPG when the 7-day retention erases the baseline they needed, when 'top SQL' is too coarse to pin a regression on a deploy, or when they need alerting and diagnostics rather than a dashboard.

What about the move to CloudWatch Database Insights?

AWS has announced that the Performance Insights dashboard and its paid retention options are being consolidated into CloudWatch Database Insights, with the standard (free) mode keeping 7-day retention and advanced features moving to a paid per-vCPU-hour mode. Practically: the free tier stays a 7-day window, and deeper analysis becomes a metered AWS spend - which is exactly the comparison point with a flat-priced PostgreSQL-native tool.

Does MonPG need more access than Performance Insights?

Yes, by design: PI works from RDS instrumentation, while MonPG connects with a monitoring role to read pg_stat_statements and related views. That connection is what buys query-fingerprint history, lock chains, and plan-level context that RDS instrumentation alone does not expose.

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