When you use SQL statements to access tables in a database without an index configured, a full table scan will be performed. If a table contains a large amount of data, this kind of scan will access a large amount of data and consume a lot of the database's resources. Which of the following options are best practices when creating database indexes? (Number of correct answers: 3)
A. Add an index to a field that is frequently queried but does not frequently perform add, delete, or modify operations.
B. Adhere to the rightmost prefix principle when using composite indexes
C. A table should not contaiiAiore than 6 indexed fields.
D. Apply indexing to fields of fixed length (preferably not long fields).
E. Applies indices to fields to contain many records.
正解:A,C,D
質問 2:
________________ is a fully-managed event-driven computing service that allows you to run code in an elastic and reliable way?
A. Batch Compute
B. Elastic Compute Service (ECS)
C. Serverless Workflow
D. Function Compute
正解:D
解説: (Pass4Test メンバーにのみ表示されます)
質問 3:
Which command should you run to create the resources described in the Terraform scripts?
A. terraform init
B. terraform destroy
C. terraform apply
D. terraform plan
正解:C
解説: (Pass4Test メンバーにのみ表示されます)
質問 4:
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?
A. The log project (Project) does not exist
B. Server internal error
C. Server is busy: please try later
D. The requested digital signature does not match
正解:A
解説: (Pass4Test メンバーにのみ表示されます)
質問 5:
Which of the following engines is NOT supported by PolarDB?
A. MongoDB
B. Oracle
C. MySQLo
D. PostgreSQL
正解:A
解説: (Pass4Test メンバーにのみ表示されます)
質問 6:
Which Alibaba Cloud service is used to manage cloud computing resources including the deployment?
A. Resource Access Management (RAM)
B. Operation Orchestration Service (OOS)
C. Resource Orchestration Service (ROS)
D. Maintenance Orchestration Service (MOS)
正解:C
解説: (Pass4Test メンバーにのみ表示されます)
河野** -
ACA-Operator本番試験に無事合格いたしました。91%で合格しました。問題の重要点を理解すれば、この一つの問題集で余裕です。