Kill YUM

How to kill a process which is using YUM for a long time

I was trying to install mysql package , but this started giving me an error.

Existing lock /var/run/yum.pid: another copy is running as pid 2254.
Another app is currently holding the yum lock; waiting for it to exit...

The lock can be broken down by deleting the data from a file called /var/run/yum.pid 

Steps to be followed :-

• Type command  vi /var/run/yum.pid
• Then in Esc Mode , Press double D (DD)
• It will delete the line (line having a number)
• Now write and save it by :wq command in Esc mode