Which of the following are the key features of DDM services?

Which of the following are the key features of DDM services?
A . Business is not interrupted, horizontal splitting and smooth expansion are automatically completed
B . Can withstand PB-level data volume, million-level concurrent volume, ten times the single-machine database connection
C . High availability of the cluster, automatic recovery in seconds
D . Compatible with MySQL protocol
E . Compatible with Oracle protocol

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Answer: ABCD