數據量很大的話，常規切換數據庫會把里面所有的表遍歷一遍，會很慢甚至是卡死。

解決方法：
登錄的時候直接在最后面加一個 -A 就行了。

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

實戰演示：
我演示的數據庫就是一個數據量很大的數據庫，切換數據庫時半天也沒有好。

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

加上參數后可以看到直接就切換成功了。

[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 - GPLCopyright (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>

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