Which of the following descriptions about the product architecture of the document database service DDS replica set is wrong?

Question

Options

• AThe master node is used for read and write requests
• BThe standby node is used for read requests
• CUsers can directly operate the primary node, standby node and hidden node
• DThe replica set architecture consists of primary nodes, standby nodes and hidden nodes

• A
  15% (6)
• B
  7% (3)
• C
  76% (31)
• D
  2% (1)

Explanation

Option C is incorrect because hidden nodes in a DDS replica set are not directly accessible to users - they are internal nodes used for purposes like data backup and incremental synchronization, and they are deliberately invisible and inaccessible at the application level. Options A and B are both accurate: the primary (master) node handles all read and write operations, while standby (secondary) nodes can serve read requests to offload traffic. Option D is also accurate, as it correctly describes the three-component architecture of a replica set: primary, standby, and hidden nodes.

Memory tip: Think of the hidden node as a "behind-the-scenes" worker - it exists to support the system internally but is never something a user touches directly. If you remember that "hidden means hands-off," you will not confuse it with the accessible primary and standby nodes.

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