Hello.I'm not sure I quite understand what you mean, the file cache does not cache your forum's files. It's the same as Redis, where it caches queries or certain other things like the data registry.
/public_html/internal_data/dbtechOptimise
Okay so i tried to turn on only guest cache with 10 minutes TTL.Certain systems may update that flag when the files are accessed as well.
That was what i thought, file cache does not have ability to delete certain cache only, so i disabled all other than guest full page caching.Yes, that's normal, as the forum/thread/post caches all get cleared whenever a new post is created. Furthermore, the Filecache (as well as certain other cachers) do not have the ability to delete only certain cache entries when your cache needs purging ("delete by prefix").
For maximum performance, you should use Redis, as this cacher has the ability to delete by prefix. Other cachers with this capability: APCu and WinCache (Windows OS only).
Filecache should not be used as your main method of caching, unless you disable all caches other than Guest Full Page Caching and Data Registry. All other caches are updated and cleared too frequently.
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