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数据量很大的话，常规切换数据库会把里面所有的表遍历一遍，会很慢甚至是卡死。

解决方法：

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

实战演示：

mysql> show databases;+--------------------+| Database           |+--------------------+| information_schema || mysql              || ncc_0807auto       || ncc_0807mysql      || performance_schema || sys                |+--------------------+6 rows in set (0.00 sec)mysql> use ncc_0807mysqlReading table information for completion of table and column namesYou can turn off this feature to get a quicker startup with -A

加上参数后可以看到直接就切换成功了。

[root@localhost ~]# "/usr/local/mysql-8.0.11/bin/mysql" -uroot -p123456 -Amysql: [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 41Server version: 8.0.11 MySQL Community Server - GPLCopyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners.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 changedmysql>

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