Once you have added channels for all of the replication sources,
issue a START REPLICA
(or before
MySQL 8.0.22, START SLAVE
)
statement to start replication. When you have enabled multiple
channels on a replica, you can choose to either start all
channels, or select a specific channel to start. For example, to
start the two channels separately, use the
mysql client to issue the following statements:
mysql> START SLAVE FOR CHANNEL "source_1";
mysql> START SLAVE FOR CHANNEL "source_2";
Or from MySQL 8.0.22:
mysql> START REPLICA FOR CHANNEL "source_1";
mysql> START REPLICA FOR CHANNEL "source_2";
For the full syntax of the START
REPLICA
command and other available options, see
Section 15.4.2.6, “START REPLICA Statement”.
To verify that both channels have started and are operating
correctly, you can issue SHOW REPLICA
STATUS
statements on the replica, for example:
mysql> SHOW SLAVE STATUS FOR CHANNEL "source_1"\G
mysql> SHOW SLAVE STATUS FOR CHANNEL "source_2"\G
Or from MySQL 8.0.22:
mysql> SHOW REPLICA STATUS FOR CHANNEL "source_1"\G
mysql> SHOW REPLICA STATUS FOR CHANNEL "source_2"\G