A business O&M worker Xiaoming is in use DRS Service does database migration, which of the following practices is correct?
A.
After the data migration is completed. Bob switches the business to the new database, and the DRS task continues to be retained without ending
B.
Bob creates a separate account for the database, which is dedicated to data migration
C.
When creating a task, the pre-check prompts that the account used for migration lacks EXECUTE_CATALOG_ROLE permission, and Xiaoming is not sure about the impact of granting this permission, so he first grants the permission and successfully creates the task, and then recycles this permission
D.
In order to load balance^ high availability, the business has multiple server nodes to provide read and write services, during the data migration process, Bob switches the traffic of one node to the new database, and the traffic of the other nodes remains on the old database
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