# ReinDB launches read-only PostgreSQL performance monitoring with query drift detection

> **Key takeaway:** ReinDB uses pg_stat_statements to establish per-query hourly baselines and flags performance deviations with ranked cost impact, fix scripts, and rollback steps without requiring any database installation.

**Published:** 2026-11-05T16:02:52.176149+00:00 
**Source:** PostgreSQL Official News 
**Category:** databases-storage 
**Canonical URL:** https://fosswire.org/news/reindb-launches-read-only-postgresql-performance-monitoring-.html 

## Summary
Bandlei has released ReinDB, a read-only performance monitoring tool for PostgreSQL that works with self-managed instances as well as Amazon RDS and Aurora. The service learns normal behavior patterns for each database and individual statement on an hourly basis using the pg_stat_statements extension, then identifies and ranks deviations by the additional database time they consume.

Each detected anomaly includes supporting evidence such as execution plan history, along with a testable fix script and corresponding undo operation for each remediation step. ReinDB requires only a single read-only login and installs no components within the target database. Deployment options include hosted service, on-premises Linux or Windows installations, or customer-managed AWS and Google Cloud accounts. The offering also supports MySQL, SQL Server, and Oracle. A single database is available free for one user without time limits or payment card requirements, and Bandlei publishes a 109-page guide titled "Rein In Your Database" documenting the underlying tuning methodology.

## How ReinDB monitors without invasive installation
- **pg_stat_statements dependency:** ReinDB relies on PostgreSQL's built-in pg_stat_statements extension to collect query execution statistics, using this data to build hourly baselines for each statement rather than deploying proprietary agents or schema changes.
- **Read-only access model:** The tool requires only a single read-only database login and installs nothing inside the monitored database, reducing security surface area and avoiding the performance overhead or maintenance burden of in-database instrumentation.
- **Drift detection with cost ranking:** Deviations from established baselines are flagged and ranked according to the additional database time they introduce, prioritizing issues by actual performance impact rather than simple threshold alerts.
- **Evidence and remediation workflow:** Each flagged issue includes plan history for root-cause analysis, plus generated fix scripts that DBAs can test in isolation with accompanying undo scripts for safe rollback.
- **Multi-platform deployment:** Beyond hosted SaaS, ReinDB runs on-premises on Linux or Windows, or within customer AWS and Google Cloud accounts, with support extending to MySQL, SQL Server, and Oracle in addition to PostgreSQL.

## Why it matters
For PostgreSQL administrators managing production workloads on RDS, Aurora, or self-managed instances, ReinDB offers a monitoring approach that avoids the privilege escalation and maintenance complications common to agent-based tools. The read-only, zero-install architecture aligns with security-conscious deployment practices in regulated environments, while the ranked cost model helps DBAs prioritize tuning effort by measurable business impact rather than noise from static thresholds. The free tier for a single database lowers the barrier for individual developers and small teams to adopt systematic performance baselining.