Oracle specifically recommends the multitenant database model for microservices because multiple Pluggable Databases can reside within one Container Database while retaining logical isolation. Oracle ' s microservices architecture guidance identifies PDBs as a strong persistence choice forbounded-context isolation, security, and high availability. Allocating a PDB per microservice isolates that service ' s private database objects while avoiding the infrastructure and operational overhead of provisioning an entire VM database system for every service. Shared schemas or shared tables weaken service autonomy and create tight coupling between bounded contexts. Because a CDB can host multiple isolated PDBs while sharing common database infrastructure and administration, option B best combines isolation with operational efficiency.