This article provides an explanation of the changes made to the way in which files are cached as Sophos Anti-Virus scans them.
Applies to the following Sophos product(s) and version(s)
Sophos Anti-Virus for Windows 2000+ 10.2.2 VDL4.84G
Sophos Anti-Virus Scanning Cache
Since the release of Sophos Anti-Virus 10.2 an updated file caching system has been implemented. Sophos Anti-Virus now regularly queries the system USN journal to check for file changes.
This means that under certain conditions, if a file has not changed since the last time it was scanned then it need not be scanned again. This can lead to performance increases as files are not needlessly re-scanned.
The journal will be ignored under the following circumstances:
- An IDE update has been performed since the last time the file was scanned
- The Sophos Anti-Virus scanning policy has been changed