If a query profile shows percentage read from cache is over 99%, what does this imply?

• A. Most data read from cache, few from cloud storage
• B. Most data read from cloud storage
• C. Cache was not used
• D. Data size is too large

Answer: (A)

When the query profile shows percentage read from cache is over 99%, it means the data required by the query was almost entirely served from the cache rather than being fetched from cloud storage. A high cache read rate indicates the cache already contains the needed data (likely from prior queries), so Snowflake can satisfy the read from fast local cache instead of hitting cloud storage, resulting in faster execution and fewer cloud I/O operations. The implication is that most data is being read from cache, with only a tiny portion possibly coming from cloud storage. This does not necessarily speak to data size, and it directly contradicts the idea that the cache wasn’t used or that reads come mainly from cloud storage.