Free ACA Developer Exam ACA-Developer Exam Practice Test

You have a Java application with source code stored on GitHub. Now you want to build a container image using this code, and store it on a Container Registry instance located in Mainland China. Which of the following is the simplest, lowest maintenance option?

• Download the Java code from GitHub to your laptop, build the Docker image using a local Dockerfile, and use docker push to upload It to Container Registry.
  
• Upload the Dockerfile to GitHub for version control, then download it together with the Java code to your local device, compile and pack container image, and upload the image to Alibaba Cloud Container Registry via docker push .
  
• Associate your Alibaba Cloud Container Registry instance with your GitHub repository, and upload the Java code and Dockerfile to GitHub Set u Jenkins environment to automate the process of building the container image and pushing it to your Container Registry instance.
  
• Associate your Alibaba Cloud Container Registry instance with your GitHub repository, and upload the Java code and Dockerfile to GitHub Th Container Registry's built-in build service, configuring a rule that will rebuild your container image whenever your GitHub code is updated
  

Alibaba Cloud Log Service is a Pay-As-You-Go service. The billing unit is 7 day, and the configuration can be adjusted at any time: fees are charged according to actual usage. Which of the following are the main charges for Log Service? (Number of correct answers: 3)

• Read and write traffic
  
• Storage capacity
  
• Index traffic after index configuration
  
• Query analysis
  

In PolarDB, if an UPDATE SQL statement encounters an issue, you need to check the execution plan to figure out the root cause. However, in the production environment, to avoid affecting the production data, what statement should you use to view the execution plan? (Number of correct answers: 2)

• explain SQL
  
• explain analyze SQL
  
• explain verbose SQL
  
• explain analyze verbose SQL
  

A developer accesses logs in a Log Service Logstore via the API. The error code returned by the server is 404. Which of these could be the cause?

• The log project (Project) does not exist
  
• The requested digital signature does not match
  
• Server internal error
  
• Server is busy: please try later
  

If a user finds that the Content Delivery Network (CDN) cache hit rate is low, what could be the reason? (Number of correct answers: 3)

• When the website has low traffic, the CDN will receive fewer requests and this will result in a lower cache hit rate.
  
• Insufficient bandwidth was selected when enabling the CDN service, causing the service capacity reach its limit too early.
  
• HTTP Header settings may cause cache misses.
  
• The origin site has a large number of dynamic resources.
  
• Cache configuration is inappropriate (ex. overly short Cache Expiry Time for popular files).
  

A developer is writing logs through the Log Service API, and can see via the Logstore monitorin metrics that write traffic is about 10 MB/s, but a 403 error is reported during the writing process. Which of these is a possible cause?

• There is significant network delay
  
• The write throughput of a single partition is limited, and the 10 MB/s write traffic exceeds
  
• There is not enough space in the Logstore partition
  
• The target partition in the Logstore is not specified
  

Which of the following programming languages are supported by the Alibaba Cloud SDK? (Number of correct answers: 3)

• Java
  
• Swift
  
• PHP
  
• Python
  
• Bash shell
  

A Developer is creating a Function Compute function. This function requires around 1 GB of temporary storage for files while executing. These files will not be needed after the function is completed for a fixed period. How can this developer MOST efficiently handle the temporary files?

• Store the files in Cloud Disk and delete the files when Function Compute function call completes.
  
• Copy the files to NFS and delete the files when the Function Compute function call completes.
  
• Store the files in the /tmp directory on a temporary ECS instance, and delete the files at when the Function Compute function call completes.
  
• Copy the files to an OSS bucket with a lifecycle policy configured to delete the files automatically.
  

Which of the following statements describes AKs (Access Keys) incorrectly?

• AK can refer to both the AccessKey ID and the AccessKey secret
  
• You can use AK to construct an API request and the corresponding resources can be manipulated if your request successfully..
  
• An AccessKey ID and AccessKey Secret cannot be used separately
  
• AccessKey Secrets for RAM sub-accounts can be queried at any time on the Console Interface after creation
  

Assume that a company uses ApsaraDB for PolarDB. The company commonly queries users based on their basic information, including: addresses, company names, and ID numbers. In this scenario, what is the best practice for creating a database index (or indexes)?

• Create a b-tree index on each column to be searched.
  
• Create a hash index on each column to be searched.
  
• Create a gin index for multiple fields.
  
• Create a gist index for multiple fields.