Oracle Oracle Certifications 1Z0-1084-20 Questions & Answers

• Question 71:

  You have been asked to create a stateful application deployed in Oracle Cloud Infrastructure (OCI)

  Container Engine for Kubernetes (OKE) that requires all of your worker nodes to mount and write data to

  persistent volumes.

  Which two OCI storage services should you use?

  A. Use OCI File Services as persistent volume.

  B. Use GlusterFS as persistent volume.

  C. Use OCI Block Volume backed persistent volume.

  D. Use open source storage solutions on top of OCI.

  E. Use OCI Object Storage as persistent volume.

  Correct Answer: AC

  A PersistentVolume (PV) is a piece of storage in the cluster that has been provisioned by an administrator. PVs are volume plugins like Volumes, but have a lifecycle independent of any individual Pod that uses the PV. A PersistentVolumeClaim (PVC) is a request for storage by a user. It is similar to a Pod. Pods consume node resources and PVCs consume PV resources. If you intend to create Kubernetes persistent volumes, sufficient block volume quota must be available in each availability domain to meet the persistent volume claim. Persistent volume claims must request a minimum of 50 gigabytes You can define and apply a persistent volume claim to your cluster, which in turn creates a persistent volume that's bound to the claim. A claim is a block storage volume in the underlying IaaS provider that's durable and offers persistent storage, enabling your data to remain intact, regardless of whether the containers that the storage is connected to are terminated. With Oracle Cloud Infrastructure as the underlying IaaS provider, you can provision persistent volume claims by attaching volumes from the Block Storage service.

• Question 72:

  Which one of the statements describes a service aggregator pattern?

  A. It is implemented in each service separately and uses a streaming service

  B. It involves implementing a separate service that makes multiple calls to other backend services

  C. It uses a queue on both sides of the service communication

  D. It involves sending events through a message broker

  Correct Answer: B

  this pattern isolates an operation that makes calls to multiple back-end microservices, centralizing its logic into a specialized microservice.