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The Cache Settings dialog is opened from the Options tab.
The cache is used to retain text extracted from processed document files, ie it does not cache text from non-processed files such as .txt files. If a file's last modification date does not match the date stored in the cache the file is re-cached to ensure search accuracy. Text is compressed before being stored in the cache to reduce disk usage but uses a very fast compression algorithm to minimize retrieval time.
The dialog shows the amount of information used by the cache, the maximum allowed size for any single document, and also the expiration policy for each document.
Maximum document size relates to the size of the extracted text not the size of the original document and defaults to around 10MB.
The default expiration is to remove any items from the cache if they have not been referenced in a search in the last 60 days.