gistfile1.txt

# yum clean all
loaded plugins: product-id, subscription-manager
Updating certificate-based repositories

Please use yum-config-manager to configure which software
repositories are used with Red Hat Subscription Management.

Cleaning repos: epel pgdg92 rhel-6-server-cf-tools-1-rpms
              : rhel-6-server-optional-rpms rhel-6-server-rhev-agent-rpms
              : rhel-6-server-rpms
Cleaning up Everything

# yum makecache
loaded plugins: product-id, subscription-manager
Updating certificate-based repositories

Please use yum-config-manager to configure which software
repositories are used with Red Hat Subscription Management.

epel/metalink                 | 3.4 kB 00:00
epel                          | 4.3 kB 00:00
epel/filelists_db             | 6.9 MB 00:00  
epel/primary_db               | 5.0 MB 00:00
epel/other_db                 | 2.8 MB 00:00
epel/group_gz                 | 229 kB 00:00
epel/updateinfo               | 512 kB 00:00
pgdg92                        | 2.8 kB 00:00
pgdg92/filelists_db           | 155 kB 00:00
pgdg92/primary_db             | 103 kB 00:00
http://yum.postgresql.org/9.2/redhat/rhel-6Server-x86_64/repodata/primary.sqlite
.bz2: [Errno -1] Metadata file does not match checksum
Trying other mirror.
pgdg92/primary_db             | 103 kB 00:00
http://yum.postgresql.org/9.2/redhat/rhel-6Server-x86_64/repodata/primary.sqlite
.bz2: [Errno -1] Metadata file does not match checksum
Trying other mirror.
Error: failure: repodata/primary.sqlite.bz2 from pgdg92: [Errno] No more mirrors to try.

I am currently seeing something similar:
pgdg92 | 2.8 kB 00:00
pgdg92/primary_db | 102 kB 00:00
http://yum.postgresql.org/9.2/redhat/rhel-6-x86_64/repodata/primary.sqlite.bz2: [Errno -1] Metadata file does not match checksum
Trying other mirror.
pgdg92/primary_db | 203 kB 00:00
http://yum.postgresql.org/9.2/redhat/rhel-6-x86_64/repodata/primary.sqlite.bz2: [Errno -1] Metadata file does not match checksum
Trying other mirror.