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NEW QUESTION 28
Per CAP theorem, in which scenario do you NOT need to make any trade-off between the guarantees?
Answer: B
Explanation:
(1) CAP THEOREM
"CONSISTENCY, AVAILABILITY and PARTITION TOLERANCE are the features that we want in our distributed system together" Of three properties of shared-data systems (Consistency, Availability and tolerance to network Partitions) only two can be achieved at any given moment in time.
(2) In a distributed system, you can have both Consistency and Availability, except when there is a Partition:
Relaxing the consistency requirements usually makes it easier to maintain availability, but the CAP theorem is not an excuse to give up strong consistency across the board. A well-designed system can balance both availability and consistency while tolerating partitions over a range of tradeoffs, where eventual consistency is just one possibility.
References:
https://blogs.oracle.com/maa/the-cap-theorem:-consistency-and-availability-except-when-partitioned
NEW QUESTION 29
You are developing a serverless application with Oracle Functions. You have created a function in compartment named prod. When you try to invoke your function you get the following error.
Error invoking function. status: 502 message: dhcp options ocid1.dhcpoptions.oc1.phx.aaaaaaaac... does not exist or Oracle Functions is not authorized to use it How can you resolve this error?
Allow function-family to use virtual-network-family in compartment prodB. Create a policy:
Allow any-user to manage function-family and virtual-network-family in compartment prodC. Create a policy:
Allow service FaaS to use virtual-network-family in compartment prodD. Deleting the function and redeploying it will fix the problem
Answer: C
Explanation:
Troubleshooting Oracle Functions:
There are common issues related to Oracle Functions and how you can address them.
Invoking a function returns a FunctionInvokeSubnetNotAvailable message and a 502 error (due to a DHCP Options issue) When you invoke a function that you've deployed to Oracle Functions, you might see the following error message:
{"code":"FunctionInvokeSubnetNotAvailable","message":"dhcp options ocid1.dhcpoptions........ does not exist or Oracle Functions is not authorized to use it"} Fn: Error invoking function. status: 502 message: dhcp options ocid1.dhcpoptions........ does not exist or Oracle Functions is not authorized to use it If you see this error:
Double-check that a policy has been created to give Oracle Functions access to network resources.
Create Policies to Control Access to Network and Function-Related Resources:
Service Access to Network Resources
When Oracle Functions users create a function or application, they have to specify a VCN and a subnet in which to create them. To enable the Oracle Functions service to create the function or application in the specified VCN and subnet, you must create an identity policy to grant the Oracle Functions service access to the compartment to which the network resources belong.
To create a policy to give the Oracle Functions service access to network resources:
Log in to the Console as a tenancy administrator.
Create a new policy in the root compartment:
Open the navigation menu. Under Governance and Administration, go to Identity and click Policies.
Follow the instructions in To create a policy, and give the policy a name (for example, functions-service-network-access).
Specify a policy statement to give the Oracle Functions service access to the network resources in the compartment:
Allow service FaaS to use virtual-network-family in compartment <compartment-name> For example:
Allow service FaaS to use virtual-network-family in compartment acme-network Click Create.
Double-check that the set of DHCP Options in the VCN specified for the application still exists.
References:
https://docs.cloud.oracle.com/en-us/iaas/Content/Functions/Tasks/functionstroubleshooting.htm
https://docs.cloud.oracle.com/en-us/iaas/Content/Functions/Tasks/functionscreatingpolicies.htm
NEW QUESTION 30
You have created a repository in Oracle Cloud Infrastructure Registry in the us-ashburn-1 (iad) region in your tenancy with a namespace called "heyci.
Which three are valid tags for an image named "myapp"?
Answer: B,C,G
Explanation:
Give a tag to the image that you're going to push to Oracle Cloud Infrastructure Registry by entering:
docker tag <image-identifier> <target-tag>
where:
<image-identifier> uniquely identifies the image, either using the image's id (for example, 8e0506e14874), or the image's name and tag separated by a colon (for example, acme-web-app:latest).
<target-tag> is in the format <region-key>.ocir.io/<tenancy-namespace>/<repo-name>/<image-name>:<tag> where:
<region-key> is the key for the Oracle Cloud Infrastructure Registry region you're using. For example, iad. See Availability by Region.
ocir.io is the Oracle Cloud Infrastructure Registry name.
<tenancy-namespace> is the auto-generated Object Storage namespace string of the tenancy that owns the repository to which you want to push the image (as shown on the Tenancy Information page). For example, the namespace of the acme-dev tenancy might be ansh81vru1zp. Note that for some older tenancies, the namespace string might be the same as the tenancy name in all lower-case letters (for example, acme-dev). Note also that your user must have access to the tenancy.
<repo-name> (if specified) is the name of a repository to which you want to push the image (for example, project01). Note that specifying a repository is optional (see About Repositories).
<image-name> is the name you want to give the image in Oracle Cloud Infrastructure Registry (for example, acme-web-app).
<tag> is an image tag you want to give the image in Oracle Cloud Infrastructure Registry (for example, version2.0.test).
For example, for convenience you might want to group together multiple versions of the acme-web-app image in the acme-dev tenancy in the Ashburn region into a repository called project01. You do this by including the name of the repository in the image name when you push the image, in the format <region-key>.ocir.io/<tenancy-namespace>/<repo-name>/<image-name>:<tag>. For example, iad.ocir.io/ansh81vru1zp/project01/acme-web-app:4.6.3. Subsequently, when you use the docker push command, the presence of the repository in the image's name ensures the image is pushed to the intended repository.
If you push an image and include the name of a repository that doesn't already exist, a new private repository is created automatically. For example, if you enter a command like docker push iad.ocir.io/ansh81vru1zp/project02/acme-web-app:7.5.2 and the project02 repository doesn't exist, a private repository called project02 is created automatically.
If you push an image and don't include a repository name, the image's name is used as the name of the repository. For example, if you enter a command like docker push iad.ocir.io/ansh81vru1zp/acme-web-app:7.5.2 that doesn't contain a repository name, the image's name (acme-web-app) is used as the name of a private repository.
https://docs.cloud.oracle.com/en-us/iaas/Content/Registry/Concepts/registrywhatisarepository.htm
NEW QUESTION 31
You are processing millions of files in an Oracle Cloud Infrastructure (OCI) Object Storage bucket. Each time a new file is created, you want to send an email to the customer and create an order in a database. The solution should perform and minimize cost, Which action should you use to trigger this email?
Answer: A
Explanation:
Oracle Cloud Infrastructure Events enables you to create automation based on the state changes of resources throughout your tenancy. Use Events to allow your development teams to automatically respond when a resource changes its state.
Here are some examples of how you might use Events:
Send a notification to a DevOps team when a database backup completes.
Convert files of one format to another when files are uploaded to an Object Storage bucket.
You can only deliver events to certain Oracle Cloud Infrastructure services with a rule. Use the following services to create actions:
Notifications
Streaming
Functions
References:
https://docs.cloud.oracle.com/en-us/iaas/Content/Events/Concepts/eventsoverview.htm
https://docs.cloud.oracle.com/en-us/iaas/Content/Notification/Concepts/notificationoverview.htm
NEW QUESTION 32
Which two handle Oracle Functions authentication automatically?
Answer: A,C
Explanation:
If you use the Fn Project CLI or the Oracle Cloud Infrastructure CLI to invoke a function, authentication is handled for you. See Using the Fn Project CLI to Invoke Functions and Using the Oracle Cloud Infrastructure CLI to Invoke Functions.
If you use an Oracle Cloud Infrastructure SDK to invoke a function, you can use the SDK to handle authentication. See Using SDKs to Invoke Functions.
If you make a signed HTTP request to a function's invoke endpoint, you'll have to handle authentication yourself by including a signature and the OCID of the compartment to which the function belongs in the request header Fn Project CLI you can create an Fn Project CLI Context to Connect to Oracle Cloud Infrastructure and specify --provider oracle This option enables Oracle Functions to perform authentication and authorization using Oracle Cloud Infrastructure request signing, private keys, user groups, and policies that grant permissions to those user groups.
References:
https://blogs.oracle.com/developers/oracle-functions-invoking-functions-automatically-with-cloud-events
https://docs.cloud.oracle.com/en-us/iaas/Content/Functions/Tasks/functionsinvokingfunctions.htm
NEW QUESTION 33
......
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