[support] When are Caches Cleared?

[Earnie Boyd]

Fred Jones wrote:

>
>> 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 cancelled and thus unpublished was still appearing on this months'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.
>

The pages are cached for anonymous users for performance.  The caches 
have a timeout value and should rebuild after they expire.  If you go to 
/admin/settings/performance, what do you have the minimum cache lifetime 
set to?

> Then he asked me, "So what, every time we make a change we have to
> know to clear the cache??"
>

I think you just need to adjust the minimum cache lifetime.  Otherwise a 
custom module with it's own cron hook could reset it for you.

> I haven't seen anywhere that page caches are rebuilt automatically
> ever so I'm guessing that maybe they're not. Ever?
>

They should be after the cache expires.

> That's the question.
>

And that's my answer. ;p

> Thanks.

HTH,
-- 
Earnie
-- http://progw.com
-- http://www.for-my-kids.com