MySQL 切换数据库、用户卡死：“You can turn off this feature to get a quicker startup with -A“处理方法

[root@localhost ~]# "/usr/local/mysql-8.0.11/bin/mysql" -uroot -p123456 -A

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| ncc_0807auto       |
| ncc_0807mysql      |
| performance_schema |
| sys                |
+--------------------+
6 rows in set (0.00 sec)

mysql> use ncc_0807mysql
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

[root@localhost ~]# "/usr/local/mysql-8.0.11/bin/mysql" -uroot -p123456 -A
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 41
Server version: 8.0.11 MySQL Community Server - GPL

Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| ncc_0807auto       |
| ncc_0807mysql      |
| performance_schema |
| sys                |
+--------------------+
6 rows in set (0.01 sec)

mysql> use ncc_0807mysql;
Database changed
mysql>