Users may see cache status Y from the Cache Monitor as shown below:

Cache status Y means the result is dirty - the cache has been updated in Intelligence Server memory since the last time it was saved to disk.
What is the difference betweeen cache status D and Y?
D means Cache Information is dirty, i.e. the Cache<GUID>_Info.che file has not been updated with the latest info (cache hit, View settings change etc). Y means the actual .che cache file is not updated.