START {SLAVE | REPLICA} [thread_types] [until_option] [connection_options] [channel_option]
thread_types:
    [thread_type [, thread_type] ... ]
thread_type:
    IO_THREAD | SQL_THREAD
until_option:
    UNTIL {   {SQL_BEFORE_GTIDS | SQL_AFTER_GTIDS} = gtid_set
          |   MASTER_LOG_FILE = 'log_name', MASTER_LOG_POS = log_pos
          |   SOURCE_LOG_FILE = 'log_name', SOURCE_LOG_POS = log_pos
          |   RELAY_LOG_FILE = 'log_name', RELAY_LOG_POS = log_pos
          |   SQL_AFTER_MTS_GAPS  }
connection_options:
    [USER='user_name'] [PASSWORD='user_pass'] [DEFAULT_AUTH='plugin_name'] [PLUGIN_DIR='plugin_dir']
channel_option:
    FOR CHANNEL channel
gtid_set:
uuid_set [, uuid_set] ...
    | ''
uuid_set:
uuid:interval[:interval]...
uuid:
hhhhhhhh-hhhh-hhhh-hhhh-hhhhhhhhhhhh
h:
    [0-9,A-F]
interval:
n[-n]

    (n >= 1)

Starts the replication threads. 启动复制线程。From MySQL 8.0.22, START SLAVE is deprecated and the alias START REPLICA should be used instead. 在MySQL 8.0.22中，不推荐使用START SLAVE，而应使用别名START REPLICA。The statement works in the same way as before, only the terminology used for the statement and its output has changed. 语句的工作方式与以前相同，只是用于语句及其输出的术语发生了更改。Both versions of the statement update the same status variables when used. 语句的两个版本在使用时更新相同的状态变量。Please see the documentation for START REPLICA for a description of the statement.有关该语句的说明，请参阅START REPLICA的文档。