1.查询
[root@VM-0-17-centos libexec]# rpm -qa|grep mariadb
mariadb-libs-5.5.65-1.el7.x86_64
mariadb-server-5.5.65-1.el7.x86_64
mariadb-5.5.65-1.el7.x86_64
2.卸载
语句:rpm -e --nodeps 软件名
实例:rpm -e --nodeps mariadb-libs-5.5.65-1.el7.x86_64
3.删除遗留
rm -rf /etc/my.cnf
rm -rf /var/lib/mysql/
4.重新安装
yum install -y mariadb mariadb-server
5.启动
systemctl enable mariadb # 设置开机自启
systemctl start mariadb