====== yumのDBが壊れた ======

  rpmdb: PANIC: fatal region error detected; run recovery
  error: db4 error(-30977) from db->sync: DB_RUNRECOVERY: Fatal error, run database recovery
  rpmdb: PANIC: fatal region error detected; run recovery
  error: db4 error(-30977) from db->sync: DB_RUNRECOVERY: Fatal error, run database recovery
  rpmdb: PANIC: fatal region error detected; run recovery


  # yum clean all
  or
  # rm /var/lib/rpm/__db*
  # rpm --rebuilddb
  # yum -y update