adv cache,memcahe

http://nubyonrails.com/articles/about-this-blog-memcached
http://blog.leetsoft.com/2007/5/22/the-secret-to-memcached
http://blog.craigambrose.com/past/2007/11/13/caching_makes_your_brain_explode/
http://ryandaigle.com/articles/2007/12/19/what-s-new-in-edge-rails-pluggable-controller-caching
http://wiki.rubyonrails.org/rails/pages/MemCached
http://ihower.idv.tw/blog/archives/1768
http://www.ibm.com/developerworks/cn/web/wa-rails1/

Don’t Expire, Just Render it Obsolete

So, here’s my first bit of advice. If you’re building a real site, go straight to memcache. If you’re not building a site for big traffic, don’t cache, just optimise any really stupid queries that are giving you trouble. If you’re using memcache, be sure to run monit too.