mysql> show processlist; +----+-------------+-----------+------+---------+-------+--------------------------------------------------------+------------------+ | Id | User | Host | db | Command | Time | State | Info | +----+-------------+-----------+------+---------+-------+--------------------------------------------------------+------------------+ | 1 | system user | | NULL | Connect | 91749 | Waiting for master to send event | NULL | | 2 | system user | | NULL | Connect | 208 | Slave has read all relay log; waiting for more updates | NULL | | 37 | root | localhost | NULL | Query | 0 | starting | show processlist | +----+-------------+-----------+------+---------+-------+--------------------------------------------------------+------------------+ 3 rows in set (0.00 sec)
mysql> show variables like 'slave_parallel_type'; +---------------------+----------+ | Variable_name | Value | +---------------------+----------+ | slave_parallel_type | DATABASE | +---------------------+----------+ 1 row in set (0.00 sec)
mysql> show variables like 'slave_parallel_workers'; +------------------------+-------+ | Variable_name | Value | +------------------------+-------+ | slave_parallel_workers | 0 | +------------------------+-------+ 1 row in set (0.01 sec)
mysql> stop slave; Query OK, 0 rows affected (0.01 sec)
mysql> set global slave_parallel_type='logical_clock'; Query OK, 0 rows affected (0.00 sec) mysql> show variables like 'slave_parallel_type'; +---------------------+---------------+ | Variable_name | Value | +---------------------+---------------+ | slave_parallel_type | LOGICAL_CLOCK | +---------------------+---------------+ 1 row in set (0.01 sec)
mysql> set global slave_parallel_workers=4; Query OK, 0 rows affected (0.00 sec) mysql> show variables like 'slave_parallel_workers'; +------------------------+-------+ | Variable_name | Value | +------------------------+-------+ | slave_parallel_workers | 4 | +------------------------+-------+ 1 row in set (0.00 sec)
mysql> start slave; Query OK, 0 rows affected (0.02 sec)
mysql> show processlist; +----+-------------+-----------+------+---------+------+--------------------------------------------------------+------------------+ | Id | User | Host | db | Command | Time | State | Info | +----+-------------+-----------+------+---------+------+--------------------------------------------------------+------------------+ | 37 | root | localhost | NULL | Query | 0 | starting | show processlist | | 38 | system user | | NULL | Connect | 8 | Waiting for master to send event | NULL | | 39 | system user | | NULL | Connect | 7 | Slave has read all relay log; waiting for more updates | NULL | | 40 | system user | | NULL | Connect | 8 | Waiting for an event from Coordinator | NULL | | 41 | system user | | NULL | Connect | 8 | Waiting for an event from Coordinator | NULL | | 42 | system user | | NULL | Connect | 8 | Waiting for an event from Coordinator | NULL | | 43 | system user | | NULL | Connect | 8 | Waiting for an event from Coordinator | NULL | +----+-------------+-----------+------+---------+------+--------------------------------------------------------+------------------+ 7 rows in set (0.00 sec)
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