What does “invalidated” cache mean in Magento?

Question

In the Magento admin under Cache Management, what does it mean when it shows a cache as invalidated? How does Magento know a cache is invalidated? In particular, I\'m wonderin

Answer 1

2015: AOE Sheduler is able to clean the cache by cronjob. Change JOB

"core_clean_cache"

from 30 2 * * * (Daily 2:30) to 59 * * * * (Every 59 Minutes).