D2 has cache files in the following location on the app server:
/tmp
The file names that can be safely deleted to clear the cache are
ls /tmp/*cache*
- xml-cache.index
- xml-cache.data
- taxonomy_level-cache.data
- dictionary_dql-cache.data
- folder-cache.data
- skin-cache.data
Sometimes if doing Tools –> Refresh Cache does not work, try deleting the above caches. This is definitely needed when doing an in place upgrade.
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