Which of the following are the key features of Huawei Cloud Distributed Database Middleware DDM service? (Multiple Choice)

Which of the following are the key features of Huawei Cloud Distributed Database Middleware DDM service? (Multiple Choice)
A . The service is not interrupted, and the horizontal split and smooth expansion are automatically completed.
B . Compatible SQL syntax
C . Can withstand PB level data, millions of concurrent, ten times the single database connection
D . The cluster is highly available, and the second-level fault is automatically restored.

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Answer: ABCD