If you have a Drupal 7 site, then you should be using the [Entity cache][ec] module, here's why: Lots and lots of things in Drupal are 'entities', such as the content, the users, the taxonomy terms and if you're using contrib modules like [Field collection][fc] or [ECK][eck], then those are entities too. Most of the time you have some fields on those entities, then every time Drupal needs to load one up, it'll also have...
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#entities
#entity cache
#Drupal Planet
#Drupalgive