Final answer:
Oracle Container Engine for Kubernetes (OKE) is the recommended OCI service for deploying Microservices-based architecture using Docker containers in the banking industry.
Step-by-step explanation:
For deploying Microservices based on a Docker container architecture within the banking sector, an ideal Oracle Cloud Infrastructure (OCI) service would be the Oracle Container Engine for Kubernetes (OKE). This service provides a cloud-native, scalable, and highly available environment that can support the dynamic nature of Microservices. Additionally, OCI's Registry service can be used to store and manage Docker container images securely, while other OCI services like API Gateway and Load Balancing can help to efficiently route traffic and manage the services at scale.