User blog comment:TOR/Caching Explained/@comment-3441771-20130328032511

Thanks, TOR! This has been really educational. I actually didn't know that Vanish existed! However: &ldquo;We also know, that the total number of pages on a wiki doesn’t change unless somebody creates one or removes some, so we keep that number handy in memory using memcache.&rdquo; Explains why this number has been a little persistent every so often. ;)