The "MySQL Database Service" on Oracle Cloud Infrastructure uses "Block Volume Storage" (C) for all
data storage. Block Volume provides high-performance, persistent block storage that is directly
attached to compute instances running the MySQL database, ensuring low-latency access for
transactional and operational workloads. "Archive Storage" (A) is for long-term, infrequently
accessed data, "Object Storage" (B) is for unstructured data, and "File Storage" (D) is for shared file
systems—none of which suit the primary storage needs of a MySQL database. Oracle’s MySQL
Database Service documentation confirms Block Volume as the default storage platform.
Reference: OCI MySQL Database Service Documentation, Oracle Storage Services Overview.
