so, we're talking about a race condition which might display outdated things in certain cases but doesn't break any data in the database.

btw., I think I like my version of using memcached more probably because it acts like a cache - requesting thread from cache - in cache ? display : get from db. actively writing all updated things to the cache is more like pushing.

For example, I have a cache of the overview page (displays the newest node of each of the sub boards), the recent 24h threads (displays a list of threads updated in the last 24 hours) and the cache of the threads themselves. When updating a thread, I delete just these three cache entries and I'm done. Following your strategy to recreate all those three entries just when updating seems to much work for me, especially if you don't know if all of these things are actually requested in the next minutes or not. Only creating when needed seems more natural to me.
And about what to cache in general, my first thing to cache here on perlmonks would be the newest nodes page, and then the RAT page. For those pages the race condition is even less important, especially it the cache just lasts for three minutes.

In reply to Re^5: PerlMonks Caching (still racy) by tinita
in thread PerlMonks Caching by ahmad

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