yum error "Error: database disk image is malformed" solution

yum -y install mathtools
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * base: centos.mirror.rafal.ca
 * epel: mirror.steadfast.net
 * extras: mirror.agmn.ca
 * rpmforge: repoforge.mirror.constant.com
 * updates: centosb5.centos.org
extras                                                                                        | 3.4 kB     00:00    
rpmforge                                                                                      | 1.9 kB     00:00    
updates                                                                                       | 3.4 kB     00:00    
updates/primary_db                                                                            | 1.9 MB     00:00    
vz-base                                                                                       |  951 B     00:00    
vz-updates                                                                                    |  951 B     00:00    
Error: database disk image is malformed

yum clean all


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