-D指定db登陆失败
#mysql -ulzl -p123456 -Dlzldb --socket=/my3456/mysql.sock
Warning: Using a password on the command line interface can be insecure.
ERROR 1044 (42000): Access denied for user 'lzldb'@'%' to database 'lzldb'困扰了很久，查了user没有问题。
原因很简单 -D参数要加到后面
#mysql -ulzl -p123456 --socket=/my3456/mysql.sock -Dlzldb
Warning: Using a password on the command line interface can be insecure.
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 200389
Server version: 5.7.26-log Source distribution
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mysql> select database();
+--------------+
| database() |
+--------------+
| lzldb |
+--------------+
1 row in set (0.00 sec)总结我已知的mysq参数问题：
1 mysql命令参数还是很敏感的，还是要注意参数顺序
2 -D参数尽量靠后
3 --defaults-file必须放在第一个参数