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https://dev.mysql.com/doc/internals/en/com-debug.html
COM_DEBUG triggers a dump on internal debug info to stdout of the mysql-server. COM_DEBUG: dump debug info to stdout Returns EOF_Packet or ERR_Packet on error Payload 1 [0d] COM_DEBUG .
https://dev.mysql.com/doc/internals/en/com-delayed-insert.html
COM_DELAYED_INSERT: an internal command in the server Payload 1 [10] COM_DELAYED_INSERT Returns ERR_Packet .
https://dev.mysql.com/doc/internals/en/com-ping.html
COM_PING: check if the server is alive Returns OK_Packet Payload 1 [0e] COM_PING .
https://dev.mysql.com/doc/internals/en/com-process-kill.html
COM_PROCESS_KILL: ask the server to terminate a connection Returns OK_Packet or ERR_Packet Payload 1 [0c] COM_PROCCESS_KILL 4 connection id . Note As of MySQL 5.7.11, COM_PROCESS_KILL is deprecated and will be removed in a future version of MySQL.
https://dev.mysql.com/doc/internals/en/com-quit.html
COM_QUIT: tells the server that the client wants to close the connection response: either a connection close or a OK_Packet Payload 1 [01] COM_QUIT Fields command (1) -- 0x01 COM_QUIT Example 01 00 00 00 01 .
https://dev.mysql.com/doc/internals/en/com-sleep.html
COM_SLEEP: internal server command Payload 1 [00] COM_SLEEP Returns ERR_Packet .
https://dev.mysql.com/doc/internals/en/com-stmt-close.html
COM_STMT_CLOSE: COM_STMT_CLOSE direction: client -> server response: none payload: 1 [19] COM_STMT_CLOSE 4 statement-id example: 05 00 00 00 19 01 00 00 00 ......... COM_STMT_CLOSE deallocates a prepared statement No response is sent back to the ...
https://dev.mysql.com/doc/internals/en/com-stmt-prepare.html
The server returns a COM_STMT_PREPARE Response which contains a statement-id which is used to identify the prepared statement. COM_STMT_PREPARE creates a prepared statement from the passed query string.
https://dev.mysql.com/doc/internals/en/com-stmt-send-long-data.html
COM_STMT_SEND_LONG_DATA: COM_STMT_SEND_LONG_DATA direction: client -> server response: none payload: 1 [18] COM_STMT_SEND_LONG_DATA 4 statement-id 2 param-id n data COM_STMT_SEND_LONG_DATA has to be sent before COM_STMT_EXECUTE.
https://dev.mysql.com/doc/internals/en/com-time.html
COM_TIME: an internal command in the server Payload 1 [0f] COM_TIME Returns ERR_Packet .