The yum system does not require any routine
maintenance. To ensure that yum operations are
carried out at optimal speed, disable or remove repository
definitions which you no longer require. You may also clear the
files from the yum caches in order to recover
disk space.
Set enable=0 in a definition file to prevent
yum from using that repository. The
yum utility ignores any definition file with
this setting.
To completely remove access to a repository:
Delete the relevant file from
/etc/yum.repos.d/.
Delete the cache directory from
/var/cache/yum/.
By default, yum retains the packages and
package data files that it downloads, so that they may be reused
in future operations without being downloaded again. To purge
the package data files, use this command:
su -c 'yum clean headers'
Run this command to remove all of the packages held in the caches:
su -c 'yum clean packages'
When using these commands, at the prompt, enter the password for
the root account.
Purging cached files causes those files to downloaded again the next time that they are required. This increases the amount of time required to complete the operation.