In the topology diagram of HUAWEI CLOUD Application Performance Management Service, each arrow line represents a call relationship, and different colors represent the health of Apdet (Application Perforsance Index is an industry standard for evaluating application performance developed by the Apdex Alliance) of the call relationship. Which of the following description is correct about the red dotted arrow line?

• A.Application and instance are not called
• B.When the application, instance or transaction is called, the response is fast, and the user experience is more satisfactory
• C.When the application, instance, or transaction is called, the response is extremely slow, and the user experience is poor
• D.The application, instance, or transaction responds slowly when called, and the user experience is like

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Which of the following options is the key feature of HUAWEI CLOUD distributed messaging DMS service?

• A.Horizontal expansion of the database
• B.Module asynchronous decoupling
• C.Key-Value data cache
• D.Mass transaction transactions

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The distributed transaction model strategy of the DDM logic library is eventual consistency. What will DDM do if the application fails to submit fragments?

• A.DDM will automatically compensate, and the reverse operation will roll back the successfully committed transactions on the shards that commit successfully.
• B.The client is required to send a rollback to roll back the successfully committed transaction on the shard that has been committed successfully.
• C.DDM will refuse to execute and return an error
• D.No transaction compensation is provided, so there will be partial execution success and partial execution failure

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Industrial Internet platforms need to consider multi-system integration. Which of the following options can be used for data integration?

• A.ROMA APIC
• B.ROMA link
• C.ROMA FDl
• D.ROMA NQS

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On the topology map of Huawei cloud application operation and maintenance, different colors represent the health of the instance. The color is determined by the Apdex value. The closer the Apdex value is to 1, the healthier the application is. If an application instance is not called by other applications, then its color is:

• A.Yellow
• B.Green
• C.Red
• D.Gray

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