A web app needs sub-millisecond reads for session tokens and cached query results. Which managed service supplies that in-memory store?
Show answer and explanation
Answer: C
Cloud Memorystore is a fully managed in-memory data service offering Redis and Memcached engines. Keeping sessions and cached results in memory gives sub-millisecond reads for hot data. Filestore provides NFS file shares, Cloud Storage holds objects with higher latency, and Bigtable is a disk-backed wide-column database, so none of them is an in-memory cache engine.
Why the other options are wrong
- A. Cloud Filestore provides managed NFS file shares for VMs and GKE. It is file storage, not a low-latency key-value cache.
- B. Cloud Storage holds objects with latency far above in-memory reads. It does not keep session data in RAM.
- D. Cloud Bigtable is a disk-backed wide-column database suited to large analytical and time-series data. It is not designed as a session or cache layer.