Free & open source · GPL-3.0

Multi-platform database monitoring, without the agents or the invoice.

DbMonitor covers SQL Server, MySQL, PostgreSQL, and MongoDB from a single web interface. No agents to deploy, no per-server licensing, no subscription. Self-hosted on IIS or Docker — your data never leaves your network.

View on GitHub Deployment docs

Why DbMonitor

No compromises on platform, agents, or cost

Most database monitoring tools make one of three compromises: SQL Server only, agents on every host, or a price tag bigger than the infrastructure they watch. DbMonitor makes none of those.

Multi-platform from the ground up

SQL Server, MySQL, PostgreSQL, and MongoDB treated as first-class citizens, not afterthoughts

Agentless

Connects directly to database instances; nothing to install on monitored servers

Read and act

Process kill and AG/InnoDB/Patroni/MongoDB failover built in, gated by role — not just dashboards

Audit-friendly

In Windows Authentication mode, the Query Tool runs under the logged-in user's identity via Kerberos delegation, so every ad-hoc query is attributed to the person who ran it

Screens

What it looks like day to day

Server Monitor for SQL Server showing jobs, replication topology, and database backup status

Server Monitor — SQL Server jobs, AG topology, and backup status.

Active Operations page showing a MongoDB live session list with Kill actions

Active Operations — MongoDB live sessions with Kill actions.

Server Monitor for MongoDB showing replica set health and pressure indicators

Server Monitor — MongoDB replica set health and pressure indicators.

DbMonitor home page showing a server health grid across platforms

Home — server health grid across every monitored platform.

Feature overview

Monitoring, DBA actions, and admin

Monitoring

Server Monitor — per-server dashboard: health, jobs, replication topology, database inventory with backup dates and AG sync state
Pressure Indicators — CPU/PLE/memory (SQL Server), buffer pool hit ratio (MySQL), cache hit ratio (PostgreSQL), ops/sec (MongoDB)
Active Processes — live process list with lock/blocking detection, auto-refreshing every 5 seconds
Top Queries — worst performers ranked by CPU, elapsed time, or logical reads
Wait Stats — SQL Server and PostgreSQL wait event analysis
Index Health — fragmented and unused index reporting
Query Tool — ad-hoc queries across all platforms, with Kerberos-delegated identity for SQL Server
Execution Plan Viewer — graphical query plans rendered in-browser

DBA actions (sqldba group)

AG Failover — SQL Server Availability Group planned failover with automatic ASYNC→SYNC promotion
MySQL Failover — InnoDB Cluster primary election
PostgreSQL Failover — Patroni switchover via REST API with elapsed-time indicator
MongoDB Failover — replica set step-down with optional target promotion
Process Kill — terminate sessions across all four platforms
Stop Job — send stop signal to an executing SQL Agent job

Admin

Server Menu Editor, Category Management, and OSS monitoring credential management

Stack

Built on .NET, runs anywhere you already run Windows or Docker

Layer	Technology
Runtime	.NET 10 · ASP.NET Core Razor Pages
Drivers	Microsoft.Data.SqlClient/SMO · MySqlConnector · Npgsql · MongoDB.Driver
HA (PostgreSQL)	Patroni REST API
UI	Bootstrap 5 · Chart.js · html-query-plan
Auth	Windows Authentication (Negotiate/Kerberos) or local accounts
Deployment	IIS (Windows) · Docker (Linux)

Need compliance evidence too?

Add DbCollector when dashboards aren't enough for an audit

DbMonitor's optional Reports section connects to DbCollector, a commercial add-on that automates privileged account inventories, configuration drift, backup coverage, and other audit evidence across your fleet.

Learn about DbCollector