How to Clean Windows Action Center Notification History Database
Location & Quick Verdict
%LocalAppData%\Microsoft\Windows\Notifications
Windows maintains a local SQLite database (wpnidm / appcache.db) storing notification toasts, badge icons, and quick actions.
How Windows Manages Windows Action Center Notification History Database on NTFS & NVMe Drives
Windows 10 and Windows 11 maintain hidden system directories and root-level allocation files at %LocalAppData%\Microsoft\Windows\Notifications to handle shell thumbnail databases, prefetcher launch traces, hibernation power states, and user-profile scratch storage. Because many of these paths are marked with +H (Hidden) or +S (System) attributes or guarded by SYSTEM ACL permissions, standard folder size scans often miss them entirely.
Over time, orphaned temporary files, stale Explorer DataCache_* buckets, and uncompacted virtual storage allocations inside %LocalAppData%\Microsoft\Windows\Notifications lock up 0.2 GB – 1.5 GB of primary C: drive space. Cleaning Windows Action Center Notification History Database using the proper administrative method restores drive headroom safely.
# Inspect current disk footprint of Windows Action Center Notification History Database (Read-Only)
$target = "$env:LOCALAPPDATA\Microsoft\Windows\Notifications"
Get-ChildItem -Path $target -Recurse -Force -ErrorAction SilentlyContinue |
Measure-Object -Property Length -Sum |
Select-Object Count, @{Name="SizeGB";Expression={[math]::Round($_.Sum / 1GB, 2)}}
Manual Cleaning Instructions
- 1 Open Task Manager and end the Windows Explorer task.
- 2 Open Terminal (Admin) and delete %LocalAppData%\Microsoft\Windows\Notifications\wpnidm.sqlite.
- 3 Start explorer.exe to reinitialize a clean notification database.
Note: If Windows alerts that a file is in use or locked by a background process, close the associated task in Task Manager before deleting, or use SWEEPR Cleaner to release locked handles safely.
Sub-Folders & Cache Locations Breakdown for Windows Action Center Notification History Database
Modern Windows applications and system services split their disk footprint across multiple sub-directories (`Cache_Data`, `Service Worker\CacheStorage`, `Code Cache`, `GPUCache`, and `Crashpad\reports`). Review which sub-folders inside Windows Action Center Notification History Database are safe to purge and which files remain protected:
| Sub-Folder / Cache Location | Storage Role | Typical Footprint | Deletion Safety |
|---|---|---|---|
| %LocalAppData%\Microsoft\Windows\Notifications | Primary System Scratch, Thumbnail/Icon DB or Virtual Allocation | 0.2 GB – 1.5 GB | 🟢 100% Safe (Unlocked Files) |
| %LocalAppData%\Temp & C:\Windows\Temp | Orphaned Installer Extraction & Session Scratch Files | 1.5 GB – 18.0 GB | 🟢 100% Safe |
| %LocalAppData%\Microsoft\Windows\Explorer (thumbcache_*.db) | Cached File Explorer Image & Video Thumbnail Databases | 250 MB – 3.0 GB | 🟢 100% Safe (Rebuilds Automatically) |
| User Documents, Desktop & Registry Hives | Personal Files, Boot Configuration & System Certificates | Protected | 🔒 Protected — Never Touched |
Frequently Asked Questions
Is it safe to delete Windows Action Center Notification History Database?
Yes, 100% safe. Safely shrinks bloated notification databases and fixes stuck, phantom, or repeating notification toasts.
How much storage space will cleaning Windows Action Center Notification History Database free up?
Users typically reclaim 0.2 GB – 1.5 GB on Windows 10 and Windows 11 systems depending on update frequency and active cache retention in %LocalAppData%\Microsoft\Windows\Notifications.
Why does Windows say some files in Windows Action Center Notification History Database are "In Use" when I try to delete them?
Active background processes (such as explorer.exe, svchost.exe, or running desktop apps) hold open file handles to current session scratch files. Skipping locked files—or letting SWEEPR Cleaner clean unlocked items automatically—is normal and completely safe.
Where is Windows Action Center Notification History Database located on Windows 10 and Windows 11?
It is stored at %LocalAppData%\Microsoft\Windows\Notifications. You can paste that path directly into the Windows Run dialog (Win + R) or File Explorer address bar to inspect it.
Manual File Explorer vs. 1-Click SWEEPR Cleanup
| Feature | Manual Deletion | SWEEPR Cleaner |
|---|---|---|
| Locked File Handling | Fails on locked processes | Safe background release |
| Accidental Deletion Risk | Moderate (easy to delete wrong folder) | Zero (strict rules & hashes) |
| Safety Undo Rollback | None (Shift+Del is permanent) | 7-Day Automatic Rollback |
| Time Required | 10–20 minutes per app | < 60 seconds across 40+ areas |
Related Windows Cleanup Guides & Hidden Space Hogs
Clean Windows Action Center Notification History Database Automatically
SWEEPR Cleaner safely clears Windows Action Center Notification History Database along with 40+ other hidden app folders and leftover files in one click—covering up to 5 devices (Windows, Mac, Android & iOS) with a 7-day undo safety net.