Final answer:
The warehouse's cache can be purged when suspending the warehouse, after the passing of 24 hours, and due to a change to the Metadata Cache size. Resuming the warehouse typically does not purge the cache.
Step-by-step explanation:
The action that causes a Warehouse's cache to be purged depends on the system in question, but generally, a warehouse cache can be purged in certain circumstances. The correct options from the list you provided are:
- Suspending the warehouse might cause the cache to be dropped, as the system assumes no further operations are immediately necessary.
- The passing of 24 hours can also purge the cache in some systems, enforcing a cache refresh to ensure data freshness.
- A change to the Metadata Cache size can trigger a cache purge since the allocation of space for metadata frequently requires reloading or clearing existing cache data to accommodate the new size settings.
The option of resuming the warehouse is not typically associated with purging a cache, as the resumed state often implies picking up where operations left off, with data still intact. It's essential to consult the documentation of the specific warehousing system in use for exact cache management behaviors.