Slave I/O tread-opracowanie

Slave I/O thread. When a START SLAVE statement is issued on a slave server, the slave creates
an I/O thread, which connects to the master and asks it to send the updates recorded in its binary
logs.
The slave I/O thread reads the updates that the master's Binlog Dump thread sends (see previous
item) and copies them to local files that comprise the slave's relay log.
The state of this thread is shown as Slave_IO_running in the output of SHOW SLAVE STATUS or
as Slave_running [613] in the output of SHOW STATUS.
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