Which statements are true regarding databases during the deployment of a new release of a service using canary deployment? (Choose two correct answers.)

Which statements are true regarding databases during the deployment of a new release of a service using canary deployment? (Choose two correct answers.)
A . Changes to the database schema can take long and reduce the database performance.
B . Traffic to the database will significantly increase because of the additional service instance.
C . The database schema must be compatible to all running versions of a service.
D . The database is locked while its content is copied to the canary database.
E . Canary deployments require two synchronized instances of each database.

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Answer: B,E