今天用

service mysqld start

命令启动mysql失败
查看mysql日志
tail -n 10 /var/log/mysql.log

160702 04:41:17 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
160702  4:41:17 [Warning] '--default-character-set' is deprecated and will be removed in a future release. Please use '--character-set-server' instead.
Unknown suffix ' ' used for variable 'lower_case_table_names' (value '1 //表名不区分大小写（此与编码无关）')
160702  4:41:17 [ERROR] /usr/libexec/mysqld: Error while setting value '1 //表名不区分大小写（此与编码无关）' to 'lower_case_table_names'
160702  4:41:17 [ERROR] Aborting

160702 04:41:17 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended

原来是之前修改配置文件惹得祸

vim /etc/my.cnf

修改配置参数，修改对应的[mysqld]节点下的： lower_case_table_names=1一行
去掉多余的注释后可以正常启动
但是执行查询语句时select * from A1;报错a1 not exists;
没办法，手起刀落人抬走，dd（vim）删掉那一行，搞定！
Yeah～