Oracle 1Z0-1084-20 Online Practice Questions and Exam Preparation

Oracle 1Z0-1084-20 Online Questions & Answers

• Question 21:

  Which two statements accurately describe Oracle SQL Developer Web on Oracle Cloud Infrastructure (OCI) Autonomous Database?

  A. It is available for databases with dedicated Exadata infrastructure only.
  B. After provisioning into an OCI compute Instance, it can automatically connect to the OCI Autonomous Databases instances.
  C. It is available for databases with both dedicated and shared Exadata infrastructure.
  D. It provides a development environment and a data modeler interface for OCI Autonomous Databases.
  E. It must be enabled via OCI Identity and Access Management policy to get access to the Autonomous Databases instances.
  A. It is available for databases with dedicated Exadata infrastructure only.
  D. It provides a development environment and a data modeler interface for OCI Autonomous Databases.

  ---

  Oracle SQL Developer Web in Autonomous Data Warehouse provides a development environment and a data modeler interface for Autonomous Databases. SQL Developer Web is available for databases with both dedicated Exadata infrastructure and shared Exadata infrastructure. https://docs.cloud.oracle.com/en-us/iaas/Content/Database/Tasks/adbtools.htm

• Question 22:

  Your Oracle Cloud Infrastructure Container Engine for Kubernetes (OKE) administrator has created an OKE cluster with one node pool in a public subnet. You have been asked to provide a log file from one of the nodes for troubleshooting

  purpose.

  Which step should you take to obtain the log file?

  A. ssh into the node using public key.
  B. ssh into the nodes using private key.
  C. It is impossible since OKE is a managed Kubernetes service.
  D. Use the username open and password to login.
  B. ssh into the nodes using private key.

  ---

  Kubernetes cluster is a group of nodes. The nodes are the machines running applications. Each node can be a physical machine or a virtual machine. The node's capacity (its number of CPUs and amount of memory) is defined when the

  node is created. A cluster comprises:

  - one or more master nodes (for high availability, typically there will be a number of master nodes)

  - one or more worker nodes (sometimes known as minions) Connecting to Worker Nodes Using SSH

  If you provided a public SSH key when creating the node pool in a cluster, the public key is installed on all worker nodes in the cluster. On UNIX and UNIX-like platforms (including Solaris and Linux), you can then connect through SSH to the

  worker nodes using the ssh utility (an SSH client) to perform administrative tasks.

  Note the following instructions assume the UNIX machine you use to connect to the worker node:

  Has the ssh utility installed.

  Has access to the SSH private key file paired with the SSH public key that was specified when the cluster was created.

  How to connect to worker nodes using SSH depends on whether you specified public or private subnets for the worker nodes when defining the node pools in the cluster. Connecting to Worker Nodes in Public Subnets Using SSH Before you

  can connect to a worker node in a public subnet using SSH, you must define an ingress rule in the subnet's security list to allow SSH access. The ingress rule must allow access to port 22 on worker nodes from source 0.0.0.0/0 and any

  source port To connect to a worker node in a public subnet through SSH from a UNIX machine using the ssh utility:

  1- Find out the IP address of the worker node to which you want to connect. You can do this in a number of ways: Using kubectl. If you haven't already done so, follow the steps to set up the cluster's kubeconfig configuration file and (if necessary) set the KUBECONFIG environment variable to point to the file. Note that you must set up your own kubeconfig file. You cannot access a cluster using a kubeconfig file that a different user set up. See Setting Up Cluster Access. Then in a terminal window, enter kubectl get nodes to see the public IP addresses of worker nodes in node pools in the cluster. Using the Console. In the Console, display the Cluster List page and then select the cluster to which the worker node belongs. On the Node Pools tab, click the name of the node pool to which the worker node belongs. On the Nodes tab, you see the public IP address of every worker node in the node pool. Using the REST API. Use the ListNodePools operation to see the public IP addresses of worker nodes in a node pool. 2- In the terminal window, enter ssh opc@ to connect to the worker node, where is the IP address of the worker node that you made a note of earlier. For example, you might enter ssh [email protected]. Note that if the SSH private key is not stored in the file or in the path that the ssh utility expects (for example, the ssh utility might expect the private key to be stored in ~/.ssh/id_rsa), you must explicitly specify the private key filename and location in one of two ways: Use the -i option to specify the filename and location of the private key. For example, ssh -i ~/.ssh/my_keys/my_host_key_filename [email protected] Add the private key filename and location to an SSH configuration file, either the client configuration file (~/.ssh/config) if it exists, or the system-wide client configuration file (/etc/ssh/ssh_config). For example, you might add the following: Host 192.0.2.254 IdentityFile ~/.ssh/my_keys/my_host_key_filename For more about the ssh utility's configuration file, enter man ssh_config Note also that permissions on the private key file must allow you read/write/execute access, but prevent other users from accessing the file. For example, to set appropriate permissions, you might enter chmod 600 ~/.ssh/my_keys/my_host_key_filename. If permissions are not set correctly and the private key file is accessible to other users, the ssh utility will simply ignore the private key file.

• Question 23:

  Which header is NOT required when signing GET requests to Oracle Cloud Infrastructure APIs?

  A. date or x-date
  B. (request-target)
  C. content-type
  D. host
  C. content-type

  ---

  For GET and DELETE requests (when there's no content in the request body), the signing string must include at least these headers: (request-target) (as described in draft-cavage-http-signatures-08) host date or x-date (if both are included, Oracle uses x-date)

  https://docs.cloud.oracle.com/en-us/iaas/Content/API/Concepts/signingrequests.htm

• Question 24:

  You have deployed a Python application on Oracle Cloud Infrastructure Container Engine for Kubernetes. However, during testing you found a bug that you rectified and created a new Docker image. You need to make sure that if this new

  Image doesn't work then you can roll back to the previous version.

  Using kubectl, which deployment strategies should you choose?

  A. Rolling Update
  B. Canary Deployment
  C. Blue/Green Deployment
  D. A/B Testing
  C. Blue/Green Deployment

  ---

  Canary deployments are a pattern for rolling out releases to a subset of users or servers. The idea is to first deploy the change to a small subset of servers, test it, and then roll the change out to the rest of the servers. The canary deployment serves as an early warning indicator with less impact on downtime: if the canary deployment fails, the rest of the servers aren't impacted. Blue-green deployment is a technique that reduces downtime and risk by running two identical production environments called Blue and Green. At any time, only one of the environments is live, with the live environment serving all production traffic. For this example, Blue is currently live and Green is idle. A/B testing is a way to compare two versions of a single variable, typically by testing a subject's response to variant A against variant B, and determining which of the two variants is more effective A rolling update offers a way to deploy the new version of your application gradually across your cluster.

• Question 25:

  You are developing a polyglot serverless application using Oracle Functions. Which language cannot be used to write your function code?

  A. PL/SQL
  B. Python
  C. Node.js
  D. Java
  A. PL/SQL

  ---

  The serverless and elastic architecture of Oracle Functions means there's no infrastructure administration or software administration for you to perform. You don't provision or maintain compute instances, and operating system software patches and upgrades are applied automatically. Oracle Functions simply ensures your app is highly-available, scalable, secure, and monitored. With Oracle Functions, you can write code in Java, Python, Node, Go, and Ruby (and for advanced use cases, bring your own Dockerfile, and Graal VM). You can then deploy your code, call it directly or trigger it in response to events, and get billed only for the resources consumed during the execution.

• Question 26:

  You are tasked with developing an application that requires the use of Oracle Cloud Infrastructure (OCI) APIs to POST messages to a stream in the OCI Streaming service. Which statement is incorrect?

  A. The request must include an authorization signing string including (but not limited to) x-content- sha256, content-type, and content-length headers.
  B. The Content-Type header must be Set to application/j son
  C. An HTTP 401 will be returned if the client's clock is skewed more than 5 minutes from the server's.
  D. The request does not require an Authorization header.
  A. The request must include an authorization signing string including (but not limited to) x-content- sha256, content-type, and content-length headers.

  ---

  Emits messages to a stream. There's no limit to the number of messages in a request, but the total size of a message or request must be 1 MiB or less. The service calculates the partition ID from the message key and stores messages that share a key on the same partition. If a message does not contain a key or if the key is null, the service generates a message key for you. The partition ID cannot be passed as a parameter. POST /20180418/streams//messages Host: streaming-api.us-phoenix-1.oraclecloud.com { "messages": { { "key": null, "value": "VGhlIHF1aWNrIGJyb3duIGZveCBqdW1wZWQgb3ZlciB0aGUgbGF6eSBkb2cu" }, { "key": null, "value": "UGFjayBteSBib3ggd2l0aCBmaXZlIGRvemVuIGxpcXVvciBqdWdzLg==" } } } https://docs.cloud.oracle.com/en-us/iaas/api/#/en/streaming/20180418/Message/PutMessages

• Question 27:

  You are building a cloud native, serverless travel application with multiple Oracle Functions in Java, Python and Node.js. You need to build and deploy these functions to a single applications named travel-app. Which command will help you complete this task successfully?

  A. oci fn function deploy --ap travel-ap --all
  B. fn deploy --ap travel-ap -- all
  C. oci fn application --application-name-ap deploy --all
  D. fn function deploy --all --application-name travel-ap
  B. fn deploy --ap travel-ap -- all

  ---

  check the steps for Creating, Deploying, and Invoking a Helloworld Function https://docs.cloud.oracle.com/en-us/iaas/Content/Functions/Tasks/functionscreatingfirst.htm in step 7 that will deploy the funcation 7- Enter the following single Fn

  Project command to build the function and its dependencies as a Docker image called helloworld-func, push the image to the specified Docker registry, and deploy the function to Oracle Functions in the helloworld-app:

  $ fn -v deploy --app helloworld-app

  The -v option simply shows more detail about what Fn Project commands are doing (see Using the Fn Project CLI with Oracle Functions).

• Question 28:

  Which concept is NOT related to Oracle Cloud Infrastructure Resource Manager?

  A. Job
  B. Stack
  C. Queue
  D. Plan
  C. Queue

  ---

  https://docs.cloud.oracle.com/en-us/iaas/Content/ResourceManager/Concepts/resourcemanager.htm Following are brief descriptions of key concepts and the main components of Resource Manager. CONFIGURATION Information to codify your infrastructure. A Terraform configuration can be either a solution or a file that you write and upload. JOB Instructions to perform the actions defined in your configuration. Only one job at a time can run on a given stack; further, you can have only one set of Oracle Cloud Infrastructure resources on a given stack. To provision a different set of resources, you must create a separate stack and use a different configuration. Resource Manager provides the following job types: Plan: Parses your Terraform configuration and creates an execution plan for the associated stack. The execution plan lists the sequence of specific actions planned to provision your Oracle Cloud Infrastructure resources. The execution plan is handed off to the apply job, which then executes the instructions. Apply. Applies the execution plan to the associated stack to create (or modify) your Oracle Cloud Infrastructure resources. Depending on the number and type of resources specified, a given apply job can take some time. You can check status while the job runs. Destroy. Releases resources associated with a stack. Released resources are not deleted. For example, terminates a Compute instance controlled by a stack. The stack's job history and state remain after running a destroy job. You can monitor the status and review the results of a destroy job by inspecting the stack's log files. Import State. Sets the provided Terraform state file as the current state of the stack. Use this job to migrate local Terraform environments to Resource Manager. STACK The collection of Oracle Cloud Infrastructure resources corresponding to a given Terraform configuration. Each stack resides in the compartment you specify, in a single region; however, resources on a given stack can be deployed across multiple regions. An OCID is assigned to each stack.

• Question 29:

  Which two statements accurately describe an Oracle Functions application?

  A. A small block of code invoked in response to an Oracle Cloud Infrastructure (OCI) Events service
  B. A Docker image containing all the functions that share the same configuration
  C. An application based on Oracle Functions, Oracle Cloud Infrastructure (OCI) Events and OCI API Gateway services
  D. A common context to store configuration variables that are available to all functions in the application
  E. A logical group of functions
  D. A common context to store configuration variables that are available to all functions in the application
  E. A logical group of functions

  ---

  Applications in the Function services In Oracle Functions, an application is:

  1.

  a logical grouping of functions

  2.

  a common context to store configuration variables that are available to all functions in the application

  When you define an application in Oracle Functions, you specify the subnets in which to run the functions in the application.

• Question 30:

  What is the open source engine for Oracle Functions?

  A. Apache OpenWhisk
  B. OpenFaaS
  C. Fn Project
  D. Knative
  C. Fn Project

  ---

  https://www.oracle.com/webfolder/technetwork/tutorials/FAQs/oci/Functions-FAQ.pdf Oracle Functions is a fully managed, multi-tenant, highly scalable, on-demand, Functions-as-a- Service platform. It is built on enterprise-grade Oracle Cloud Infrastructure and powered by the Fn Project open source engine. Use Oracle Functions (sometimes abbreviated to just Functions) when you want to focus on writing code to meet business needs.