install MariaDB & Transaction ch

查看系统中是否已安装 MariaDB，mysql

rpm -qa | grep -i mariadb
rpm -qa | grep -i mysql
yum -y remove 包名

执行以下命令，在 /etc/yum.repos.d/ 下创建 MariaDB.repo 文件

vi /etc/yum.repos.d/MariaDB.repo

# MariaDB 10.4 CentOS repository list - created 2019-11-05 11:56 UTC
# http://downloads.mariadb.org/mariadb/repositories/
[mariadb]
name = MariaDB
baseurl = http://yum.mariadb.org/10.4/centos7-amd64
gpgkey=https://yum.mariadb.org/RPM-GPG-KEY-MariaDB
gpgcheck=1

执行以下命令，安装 MariaDB

yum -y install MariaDB-client MariaDB-server

Transaction check error:
  file /usr/share/mysql/charsets/Index.xml from install of MariaDB-common-10.4.12-1.el7.centos.x86_64 conflicts with file from package mysql-community-common-5.7.28-1.el7.x86_64
 .............
  file /usr/share/mysql/serbian/errmsg.sys from install of MariaDB-server-10.4.12-1.el7.centos.x86_64 conflicts with file from package mysql-community-common-5.7.28-1.el7.x86_64
  file /usr/share/mysql/slovak/errmsg.sys from install of MariaDB-server-10.4.12-1.el7.centos.x86_64 conflicts with file from package mysql-community-common-5.7.28-1.el7.x86_64
  file /usr/share/mysql/spanish/errmsg.sys from install of MariaDB-server-10.4.12-1.el7.centos.x86_64 conflicts with file from package mysql-community-common-5.7.28-1.el7.x86_64
  file /usr/share/mysql/swedish/errmsg.sys from install of MariaDB-server-10.4.12-1.el7.centos.x86_64 conflicts with file from package mysql-community-common-5.7.28-1.el7.x86_64
  file /usr/share/mysql/ukrainian/errmsg.sys from install of MariaDB-server-10.4.12-1.el7.centos.x86_64 conflicts with file from package mysql-community-common-5.7.28-1.el7.x86_64
  file /usr/share/mysql/errmsg-utf8.txt from install of MariaDB-server-10.4.12-1.el7.centos.x86_64 conflicts with file from package mysql-community-common-5.7.28-1.el7.x86_64

错误概要
-------------

错误解决：

[root@VM_12 ~]# rpm -e mysql-community-common-5.7.28-1.el7.x86_64
错误：依赖检测失败：
    mysql-community-common(x86-64) >= 5.7.9 被 (已安裝) mysql-community-libs-5.7.28-1.el7.x86_64 需要
[root@VM_12 ~]# rpm -e mysql-community-client-5.7.28-1.el7.x86_64
[root@VM_12_4 ~]#  rpm -qa | grep -i mysql
mysql-community-common-5.7.28-1.el7.x86_64
mysql-community-libs-5.7.28-1.el7.x86_64
[root@VM_12_4 ~]# yum -y remove mysql-community-common-5.7.28-1.el7.x86_64

1. 执行以下命令，启动 MariaDB 服务。

   systemctl start mariadb
   

2. 执行以下命令，设置 MariaDB 为开机自启动。

   systemctl enable mariadb
   

3. 执行以下命令，验证 MariaDB 是否安装成功。

   mysql