PerformanceMonitor

# SQL Server Performance Monitor

> Free, open-source SQL Server performance monitoring tool by Erik Darling (Darling Data, LLC). 41 T-SQL collectors, real-time alerts, graphical execution plan viewer, and a built-in MCP server with 87-151 tools for AI-powered analysis. Two current editions: Lite (standalone desktop app with DuckDB storage) and Darling (headless 24/7 service with a central PostgreSQL/TimescaleDB store plus a detached viewer); the older Full/Dashboard edition is deprecated. Replaces expensive commercial tools like SentryOne and Solarwinds DPA. MIT licensed.

- Supports SQL Server 2016-2025, Azure SQL Managed Instance, AWS RDS for SQL Server, and Azure SQL Database (Lite only)
- Monitors wait stats, query performance, blocking chains, deadlocks, memory grants, file I/O, tempdb, CPU, perfmon counters, and more
- Real-time alerts via system tray notifications and styled HTML emails
- Built-in MCP server exposes monitoring data to Claude Code, Cursor, and other LLM clients
- 4,300+ downloads across releases

## Documentation

- [README](https://github.com/erikdarlingdata/PerformanceMonitor/blob/main/README.md): Complete documentation including quick start, permissions, collector reference, alert configuration, MCP server setup, and edition comparison
- [Releases](https://github.com/erikdarlingdata/PerformanceMonitor/releases): Download pre-built binaries
- [Product page](https://erikdarling.com/free-sql-server-performance-monitoring/): Overview and commercial support options

## Optional

- [Third-party notices](https://github.com/erikdarlingdata/PerformanceMonitor/blob/main/THIRD_PARTY_NOTICES.md): License information for bundled components
- [License](https://github.com/erikdarlingdata/PerformanceMonitor/blob/main/LICENSE): MIT License