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.
Answer: ABCD