mysql 5.7在从库停止复制进程时出现错误，原因是将复制信息记录表中了。
错误提示：
ERROR 1794 (HY000): Slave is not configured or failed to initialize properly. You must at least set --server-id to enable either a master or a slave. Additional error messages can be found in the MySQL error log.
解决方法：
use mysql
drop table slave_master_info;
drop table slave_relay_log_info;
drop table slave_worker_info;
drop table innodb_index_stats;
drop table innodb_table_stats;
source /usr/coolpad/mysql/share/mysql_system_tables.sql
重新启动数据库
