http://www.lullabot.com/articles/a_beginners_guide_to_caching_data http://drupal.org/node/326504
Yes, I've seen these but I still haven't found the answer. Perhaps I have found it, by default.
Your question is vague.
Right--my mistake.
Why do you ask? Are you developing code and not seeing the caches change or is there some production issue you need resolved?
The issue is that a client called me to ask why an event that he cancelled and thus unpublished was still appearing on this months' calendar page. He had even deduced that this was a problem only for anonymous users. So I cleared the page cache and it was fixed.
Then he asked me, "So what, every time we make a change we have to know to clear the cache??"
I haven't seen anywhere that page caches are rebuilt automatically ever so I'm guessing that maybe they're not. Ever?
That's the question.
Thanks.