近来发现开发机上的 MariaDB 似乎挂了。幸亏不是在生产机上挂数据库。
具体的表现是：无法启动，启动时报错如下：
[ERROR] Could not open mysql.plugin table. Some plugins may be not loaded
[ERROR] Can't open and lock privilege tables: Table 'mysql.servers' doesn't exist
[ERROR] Fatal error: Can't open and lock privilege tables: Table 'mysql.db' doesn't exist
[ERROR] Aborting
这就很刺激了。mysql 库没了。
那么只能重新安装数据库了：
# mysql_install_db --user=mysql
# mysql_secure_install
mysql 库丢失也会顺带拉着插件表、用户表和用户权限表一并丢失。不过数据库本身（如果不是删库操作的话）并不会丢失。在完成 mysql 库的恢复后，重新添加用户并授予相应的权限就可以了。
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