Apparatus and method for processing read command in zoned namespace based on deterioration state of memory device

An operating method of a memory system, the operating method comprising:

• receiving a read command from a host;
• checking a zoned namespace (ZNS) corresponding to a read operation in response to the received read command;
• checking whether the checked ZNS is a sacrifice ZNS corresponding to a target for a background operation;
• storing the read command in a delay queue when the ZNS is the sacrifice ZNS;
• calculating a delay time of each of the read commands stored in the delay queue for each preset calculation time;
• and
• processing the read command after delaying the read command based on the calculated delay time, and further comprising:
• inputting the read command to a first command queue when receiving the read command from the host,
• inputting, to a second command queue, the read command output from the delay queue based on the delay time, and
• alternately outputting the read commands stored in the first command queue and the second command queue.