> According to Apple's manual, Mail searches all folders like this: > "Searching looks at the address fields, the subject, and the message > body." FYI when we found out about this change, we made all BODY searches from iOS become FUZZY BODY searches to make them work reasonably. http://blog.fastmail.fm/2013/09/17/ios-7-mail-app-uses-multi-folder-body-searches-by-default/ This works great with the xapian indexes we have, though it searches for "terms" not "sub-strings". On the other hand, there is one massive performance win. The xapian index is considered "complete", unlike the squatter index which just says "maybe". This means we can return a UID list directly from the xapian index without having to actually open any emails. With squatter, the index tells it which emails *might* contain the sub-string. It then has to actually open each email file to check if the sub-string is in there, quite a bit of slow & random IO. Also any emails not in the squatter index have to be opened and checked as well. As Bron mentioned in another post, our xapian index is kept up-to-date in realtime by indexing newly arrived emails into tmpfs, which are then compressed down to a disk at regular intervals. All up, the approach works amazingly well. Rob ---- Cyrus Home Page: http://www.cyrusimap.org/ List Archives/Info: http://lists.andrew.cmu.edu/pipermail/info-cyrus/ To Unsubscribe: https://lists.andrew.cmu.edu/mailman/listinfo/info-cyrus
