Quick Answer
mssql-tool-updater is Microsoft's utility that automatically checks for and installs updates to MSSQL command-line tools (sqlcmd, bcp, and related tooling). It keeps tooling current, validates signatures, and can run on demand or on a schedule.
Is it a Virus?
NO - Safe
Must be in C:\Program Files\Microsoft SQL Server Tooling\mssql-tool-updater.exe
Can I Disable?
YES
Disabling stops automatic updates; manual updates are still possible but tooling may become out-of-date.
What is mssql-tool-updater.exe?
mssql-tool-updater is a Windows utility from Microsoft that automates checking, downloading, and installing updates for MSSQL command-line tools used with SQL Server (such as sqlcmd and bcp). It helps maintain compatibility, security, and stability by keeping tooling current across supported SQL Server versions.
The updater fetches official tooling packages, validates signatures and checksums, then performs a silent install to replace older binaries. It respects user preferences and operates in the background when configured.
Quick Fact: The updater coordinates with the official Microsoft SQL Server Tooling packages to ensure the CLI tools match your installed SQL Server version.
Types of mssql-tool-updater Processes
- Updater Process: Orchestrates checks, downloads, and sequencing of updates
- Downloader Process: Fetches update packages from Microsoft servers
- Installer Process: Performs silent installation of updated tooling
- Validator Process: Verifies digital signatures and file integrity
- Background Service: Optional service for scheduled checks
- Notifier Process: Alerts user about update status
Is mssql-tool-updater Safe?
Yes, mssql-tool-updater is safe when downloaded from official Microsoft sources and when the digital signature shows "Microsoft Corporation" as the signer.
Is mssql-tool-updater a Virus or Malware?
The updater is not a virus. Ensure it's from Microsoft and verify the digital signature. If located in unusual folders or with no signature, scan your system.
How to Tell if mssql-tool-updater is Legitimate or Malware
- File Location:: Must be in
C:\Program Files\Microsoft SQL Server Tooling\mssql-tool-updater.exe or C:\Program Files (x86)\Microsoft SQL Server Tooling\mssql-tool-updater.exe. Any other path is suspicious.
- Digital Signature:: Right-click the updater executable in File Explorer → Properties → Digital Signatures. Should show "Microsoft Corporation" as the signer.
- Resource Usage:: Normal usage is 2-12% CPU and 60-120 MB memory. Constant high usage when idle is suspicious.
- Behavior:: Updater should run only during update checks or installations. Persistent background activity when idle indicates potential malware.
Red Flags: If updater.exe is located in Temp, AppData\Local, or System32 without a valid signature, or if it launches outside update windows, scan for malware.
Why Is mssql-tool-updater Running on My PC?
mssql-tool-updater runs to keep MSSQL command-line tools up to date with the latest security fixes, features, and compatibility for your SQL Server version.
Reasons it's running:
- Active Tool Update: It checks for and applies updates to MSSQL CLI tools when a newer version is available.
- Background Maintenance: Configured to run on a schedule to maintain tooling without requiring manual checks.
- Startup or Service: Can run as a Windows service or a scheduled task to keep tooling current.
- Version Compatibility: Updates are validated against your installed SQL Server version to avoid incompatibilities.
- IT Policy or Admin: If deployed by an admin, updates may occur during maintenance windows or controlled via policy.
Can I Disable or Remove mssql-tool-updater?
Yes, you can disable mssql-tool-updater. Stopping automatic updates will prevent silent updates, but you can still update manually when needed.
How to Stop mssql-tool-updater
- End Update Task: Open Task Scheduler → Task Library → select 'mssql-tool-updater' → Disable
- Stop Background Service: If installed as a Windows service, open services.msc → find 'MSSQL Tool Updater' → Stop
- Prevent Startup: Disable startup entries or scheduled tasks related to the updater
- Run Updates Manually: Launch mssql-tool-updater as Administrator and click Check for Updates when needed
- Uninstall: Windows Settings → Apps → Apps & Features → mssql-tool-updater → Uninstall
How to Uninstall mssql-tool-updater
- ✔ Windows Settings → Apps → Apps & Features → mssql-tool-updater → Uninstall
- ✔ Control Panel → Programs → Uninstall a program → mssql-tool-updater → Uninstall
- ✔ If part of SQL Server Toolkit, use the Microsoft SQL Server Installer to modify components and remove tooling
Common Problems: Update Check or Installation Failures
If mssql-tool-updater is failing to check for updates or install updates, there are common causes and fixes specific to MSSQL tooling.
Common Causes & Solutions
- Network connectivity issues: Ensure you have a stable connection, disable VPNs that block Microsoft domains, and verify DNS resolves download sites.
- Insufficient permissions: Run as Administrator; ensure the user is in the Administrators group and UAC prompts are allowed.
- Corrupted updater cache: Clear cache at C:\ProgramData\MSSQLTooling\Updater\Cache and restart the updater.
- Outdated OS or components: Install Windows updates and required runtime components (like .NET) if prompted.
- Conflicting security software: Add exceptions for the updater and its download URLs; temporarily disable conflicting security tools.
- Misconfigured scheduled task: Open Task Scheduler and ensure the mssql-tool-updater task is configured with correct run conditions and permissions.
Quick Fixes:
1. Quick Fixes:
2. 1. Run mssql-tool-updater as Administrator and click Check for Updates
3. 2. Verify internet access and that Windows Firewall allows Microsoft connectivity
4. 3. Clear updater cache at C:\ProgramData\MSSQLTooling\Updater\Cache and restart
5. 4. Temporarily disable antivirus or add exceptions for mssql-tool-updater.exe
6. 5. Check for pending Windows updates and install
Frequently Asked Questions
Is mssql-tool-updater safe to use?
Yes. mssql-tool-updater is safe when obtained from official Microsoft sources and when the executable shows a Microsoft Corporation signature.
What tools does mssql-tool-updater update?
It updates MSSQL CLI tools like sqlcmd and bcp, keeping compatibility with your SQL Server version and OS.
Can I disable automatic updates?
Yes, you can disable automatic updates; you can still run updates manually when needed.
Where are update logs stored?
Logs are stored in C:\ProgramData\MSSQLTooling\Updater\logs with per-update entries.
How do I update manually?
To update manually, run mssql-tool-updater.exe as Administrator and click Check for Updates, or use the SQL Server Installer for component updates.
Does it require additional dependencies?
No, it should not require third-party components; it relies on Microsoft tooling packages and the system's prerequisites.