Why is the "SQL Server Windows NT - 64 Bit" service running on my Windows Server?

There are several potential reasons why the "SQL Server Windows NT - 64 Bit" service might be running on your Windows Server 2019, even if you don't believe you've installed SQL Server:

• Pre-installed SQL Server:
  • Some editions of Windows Server 2019, like the Essentials edition, come with pre-installed SQL Server for specific features.
  • Even if you didn't choose to install SQL Server during the initial setup, it might be included in your edition.
• Embedded SQL Server Components:
  • Certain applications might use embedded SQL Server components without explicitly requiring a full SQL Server installation.
  • Some Windows system services might rely on SQL Server for their functionality.
• Previous Installations:
  • If you've previously installed SQL Server and then uninstalled it, residual files or registry entries might still be present, causing the service to start.
• Third-Party Software:
  • Third-party software might bundle or install SQL Server components without your knowledge.
• Network-Based SQL Server:
  • If your Windows Server 2019 is part of a network, it might be connecting to a remote SQL Server instance, causing the service to run.

To determine the exact reason:

1. Check Windows Features: Go to "Control Panel" -> "Programs" -> "Programs and Features" -> "Turn Windows features on or off". Look for any SQL Server-related features that are enabled.
2. Review Installed Applications: Check your installed applications list for any software that might use SQL Server.
3. Inspect Services: Open "Services" (services.msc) and look for any SQL Server-related services that are running.
4. Check Event Viewer: Look for any error or warning messages related to SQL Server in the Event Viewer.
5. Consult Documentation: If you're using a specific application or system service, consult its documentation to see if it requires SQL Server.

Once you've identified the cause, you can decide whether to keep the service running or disable it if it's no longer needed. If you're unsure, it's generally recommended to leave it running unless you encounter issues or have a specific reason to disable it.