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Automated security scan — not a certification.
Free, open-source SQL Server and Postgres performance monitoring. Collectors, real-time alerts, graphical plan viewer, MCP server for AI analysis. Supports SQL 2016-2025, Azure SQL, AWS RDS, Postgres, Aurora Postgres.
# Add to your Claude Code skills
git clone https://github.com/erikdarlingdata/PerformanceMonitorGuides for using mcp servers skills like PerformanceMonitor.
Last scanned: 5/23/2026
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"status": "PASSED",
"scannedAt": "2026-05-23T06:35:34.587Z",
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}See how PerformanceMonitor compares with popular alternatives.
PerformanceMonitor is an open-source mcp servers skill for AI coding assistants such as Claude Code, Codex CLI, and ChatGPT, built by erikdarlingdata. Free, open-source SQL Server and Postgres performance monitoring. Collectors, real-time alerts, graphical plan viewer, MCP server for AI analysis. Supports SQL 2016-2025, Azure SQL, AWS RDS, Postgres, Aurora Postgres. It has 520 GitHub stars.
Yes. PerformanceMonitor passed SkillsLLM's automated security scan — a dependency vulnerability audit plus prompt-injection heuristics — with no high-severity issues. You can read the full report in the Security Report section on this page.
Clone the repository with "git clone https://github.com/erikdarlingdata/PerformanceMonitor" and add it to your Claude Code skills directory (see the Installation section above).
PerformanceMonitor is primarily written in C#. It is open-source under erikdarlingdata on GitHub, so you can review or fork the full source.
Yes. SkillsLLM lists many other MCP Servers skills you can browse and compare side by side. Open the MCP Servers category from the badge at the top of this page, or use the Related Skills and comparison links further down to weigh PerformanceMonitor against similar tools.
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⚠️ Third-Party Software Notice
This skill is third-party open-source software developed and hosted independently on GitHub. SkillsLLM is an informational directory and does not control or maintain the underlying repository.
Any security checks, ratings, or warnings displayed by SkillsLLM are automated and limited in scope. They do not constitute a security certification or guarantee that the software is safe, error-free, or free from malicious code, vulnerabilities, compromised dependencies, or prompt-injection risks.
Review the source code, permissions, dependencies, and configuration before installing or running any third-party skill. Use is at your own risk. To the maximum extent permitted by applicable law, SkillsLLM is not liable for losses arising from third-party software.
Automated security scan — not a certification.
Free, open-source monitoring that replaces the tools charging you thousands per server per year. Specialized collectors, real-time alerts, and a built-in MCP server for AI analysis. Nothing phones home. Your data stays on your server and your machine.
Supported: SQL Server 2016 SP2–2025 (2017 needs CU3 or later) | Azure SQL Managed Instance | AWS RDS for SQL Server | Azure SQL Database (Lite and Darling) | PostgreSQL, including AWS RDS and Aurora (Darling)
Pick by how you want collection to run — the monitoring brain (collectors, alert engine, plan analysis, MCP tools) is shared across all three at the library level.
| Lite — flagship | Darling — headless | Dashboard — deprecated | |
|---|---|---|---|
| How it runs | Single desktop app monitors remotely, on demand | Service on Windows or Linux collects 24/7 into a central store. The Windows viewer and the web dashboard read it from any seat | SQL-Server-installed database + Agent collectors, separate viewer app |
| Installs on your server? | No | No | Yes (a PerformanceMonitor database) |
| Stores data | Local DuckDB + Parquet | PostgreSQL + TimescaleDB (bundled on Windows) | In the target SQL Server |
| Best for | Quick triage, Azure SQL DB, locked-down servers, consultants, firefighting | Always-on monitoring of many SQL Server and PostgreSQL servers from one service | Existing installs only — new deployments should use Lite or Darling |
| Requires | VIEW SERVER STATE (permissions) |
VIEW SERVER STATE (SQL Server) or these grants (PostgreSQL), plus a place to run the service |
SQL Agent (Dashboard docs) |
⚠️ The "Full" Dashboard edition is deprecated. Existing installs keep working and remain on bug-fix support, but it is no longer the recommended path and — as of v3.3.0 — the Dashboard and its CLI installer are no longer included in release assets. The last shipped builds are in the v3.2.0 release, and both remain buildable from the repo. New deployments should use Lite or Darling. Its docs live with the code: deprecated/Dashboard/README.md (the app, tabs, permissions) and deprecated/Installer/README.md (the CLI database installer).
👉 Not sure? Start with Lite. One download, nothing installed on your server, data flowing in under 5 minutes.
All editions include real-time alerts (email + webhooks), charts and graphs, dark and light themes, CSV export, and a built-in MCP server for AI-powered analysis with tools like Claude. Lite and Dashboard also show alerts in the system tray. All release binaries are digitally signed via SignPath — no more Windows SmartScreen warnings.
"You guys make us DBAs look like absolute rockstars. I'm over here getting showered with praise, and all I do is use your scripts and follow your advice."
"replaced SentryOne and had it running in 10 minutes"
"I've had enough time to gather data and converse with Claude on this. It helped a lot to zone in on CPU starvation from the hypervisor on which the VM runs. IT team currently investigating the host configuration."
🔍 Specialized collectors on configurable schedules — wait stats, query performance, blocking chains, deadlock graphs, memory grants, file I/O, tempdb, perfmon counters, FinOps/capacity, and more. Query text and execution plan collection can be disabled per-collector for sensitive environments.
🚨 Real-time alerts for blocking, deadlocks, and high CPU — system tray notifications, styled HTML emails with full XML attachments, and webhook notifications for external integrations
📊 NOC-style overview with green/yellow/red health cards, auto-refresh, configurable time ranges, and dark/light themes
📋 Graphical plan viewer with native ShowPlan rendering, 30-rule PlanAnalyzer, operator-level cost breakdown, and a standalone mode for opening .sqlplan files without a server connection
💡 Recommendations engine (advise-and-act) — a dedicated Recommendations tab surfaces prioritized findings from your own monitoring data with the reasoning behind each one, and can apply selected fixes directly. Destructive changes (like enabling Read Committed Snapshot Isolation) are gated behind an informed-consent dialog that spells out both the risk of acting and the risk of doing nothing.
🤖 Built-in MCP server with read-only tools for AI analysis — ask Claude Code or Cursor "what are the top wait types on my server?" and get answers from your actual monitoring data
🔒 Your data never leaves — no telemetry, no cloud dependency, no phoning home. Credentials stored in Windows Credential Manager with OS-level encryption. Statement text that can carry a credential, such as CREATE LOGIN or a PASSWORD = literal, reads -- statement text withheld (#4348) in alerts and plan analysis. Darling also withholds it from collected data, MCP answers and web pages.
PerformanceMonitorLite-win-Setup.exe — a self-contained build, so there is no .NET runtime to install first.%LocalAppData%\PerformanceMonitorLite, adds Start Menu and Desktop shortcuts, and registers the app under Apps & Features so it shows up in Windows search and can be uninstalle