In my practice I've never really faced with situation that it was needed to clean the collection cache. It is strange)
I checked and detected that the magento uses the collection cache only for 4 entities:


These entities uses for their collections the virtual types based on


which in turn uses \Magento\Framework\App\Cache\Type\Collection for defining the cache type - collection.

You can find the all SQL-queries which used (after md5 tranformation) as cache keys - see the fetchAll method.

And these SQL-queries only to tables which related to entities listed above.

Why doesn't magento use the collection cache for other entities, such as products or CMS-pages?

When should we use the collection cache for own custom entities?

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