OCI-03973
Sync point for Barrier DDL with ID string on string.string timed out after waiting string seconds for the replication units string
Cause
The sync point for DDL statement failed or timed out on a replication unit follower shard that was waiting for a leader shard to send a DDL completion message.
Action
Ensure that all database shards for a given replication unit are running with minimal disruptions when executing DDL.