MongoDB副本集(Replica Set)，哪一種類型的節點只有一個?
整個副本集只有一個primary
Below is an instruction that describes a task. Write a response that appropriately completes the request. ### Instruction: MongoDB副本集(Replica Set)，哪一種類型的節點只有一個? ### Response: 整個副本集只有一個primary 