YUM是基于RPM的软件包管理器
YUM is an RPM-based package manager
补充说明
Supplementary note
yum命令是在Fedora和RedHat以及SUSE中基于rpm的软件包管理器，它可以使系统管理人员交互和自动化地更新与管理RPM软件包，能够从指定的服务器自动下载RPM包并且安装，可以自动处理依赖性关系，并且一次安装所有依赖的软体包，无须繁琐地一次次下载、安装。yum提供了查找、安装、删除某一个、一组甚至全部软件包的命令，而且命令简洁而又好记。
The yum command is a rpm-based package manager in Fedora, RedHat and SUSE. It enables system administrators to interactively and automatically update and manage RPM packages. It can automatically download and install RPM packages from a specified server, and can be processed automatically Dependency relationship, and install all dependent software packages at one time, no need to download and install tediously again and again. Yum provides commands to find, install, delete a certain, a group or even all packages, and the commands are concise and easy to remember.
问题：
在使用yum安装时，卡死并且无法Ctrl+c终止，需要将其杀死才能停止。
如下图：
When using yum to install, it is stuck and cannot be terminated by Ctrl+c. You need to kill it to stop.
解决办法：
删除rpm数据文件后再重建rpm数据文件：
Rebuild the rpm data file after deleting the rpm data file:
删除rpm数据文件
Delete rpm data file
rm -f /var/lib/rpm/__db.00*
重建rpm数据文件
Rebuild rpm data file
rpm -vv --rebuilddb
清空缓存后再重新缓存
Re-cache after clearing the cache
yum clean all
yum makecache
然后删除下列两个文件就可以了