CentOS yum update แล้วเออเร่อครับ ต้องแก้ยังไงครับ

[root@20up ~]# yum update                                                       Setting up Update Process
base                                                     | 3.7 kB     00:00
base/primary_db                                          | 4.6 MB     00:00
epel/metalink                                            | 4.6 kB     00:00
epel                                                     | 4.3 kB     00:00
epel/primary_db                                          | 5.8 MB     00:00
extras                                                   | 3.4 kB     00:00
extras/primary_db                                        |  37 kB     00:00
ius                                                      | 2.2 kB     00:00
ius/primary_db                                           | 198 kB     00:00
remi                                                     | 2.9 kB     00:00
remi/primary_db                                          | 1.4 MB     00:02
remi-safe                                                | 2.9 kB     00:00
remi-safe/primary_db                                     | 281 kB     00:01
updates                                                  | 3.4 kB     00:00
updates/primary_db                                       | 5.2 MB     00:00
vz-base                                                  |  951 B     00:00
vz-base/primary                                          | 1.3 kB     00:00
vz-base                                                                     3/3
vz-updates                                               |  951 B     00:00
vz-updates/primary                                       | 2.2 kB     00:00
vz-updates                                                                  8/8
webtatic                                                 | 3.6 kB     00:00
webtatic/primary_db                                      | 243 kB     00:00
Traceback (most recent call last):
  File "/usr/bin/yum", line 29, in <module>
    yummain.user_main(sys.argv[1:], exit_code=True)
  File "/usr/share/yum-cli/yummain.py", line 300, in user_main
    errcode = main(args)
  File "/usr/share/yum-cli/yummain.py", line 146, in main
    result, resultmsgs = base.doCommands()
  File "/usr/share/yum-cli/cli.py", line 440, in doCommands
    return self.yum_cli_commands[self.basecmd].doCommand(self, self.basecmd, self.extcmds)
  File "/usr/share/yum-cli/yumcommands.py", line 233, in doCommand
    return base.updatePkgs(extcmds, update_to=(basecmd == 'update-to'))
  File "/usr/share/yum-cli/cli.py", line 728, in updatePkgs
    self.update()
  File "/usr/lib/python2.6/site-packages/yum/__init__.py", line 3791, in update
    updates = self.up.getUpdatesTuples()
  File "/usr/lib/python2.6/site-packages/yum/__init__.py", line 926, in <lambda>
    up = property(fget=lambda self: self._getUpdates(),
  File "/usr/lib/python2.6/site-packages/yum/__init__.py", line 744, in _getUpdates
    self._up = rpmUtils.updates.Updates(self.rpmdb.simplePkgList(), self.pkgSack.simplePkgList())
  File "/usr/lib/python2.6/site-packages/yum/packageSack.py", line 549, in simplePkgList
    patterns, ignore_case)
  File "/usr/lib/python2.6/site-packages/yum/packageSack.py", line 599, in _computeAggregateListResult
    sackResult = apply(method, args)
  File "/usr/lib/python2.6/site-packages/yum/sqlitesack.py", line 1695, in simplePkgList
    ignore_case):
  File "/usr/lib/python2.6/site-packages/yum/sqlitesack.py", line 1597, in _yieldSQLDataList
    for x in cur:
MemoryError
no mem for new parser
Error in atexit._run_exitfuncs:
Traceback (most recent call last):
  File "/usr/lib64/python2.6/atexit.py", line 24, in _run_exitfuncs
    func(*targs, **kargs)
  File "/usr/lib/python2.6/site-packages/yum/plugins.py", line 176, in run
    conduitcls = eval(conduitcls)       # Convert name to class object
MemoryError
Error in sys.exitfunc:
Traceback (most recent call last):
  File "/usr/lib64/python2.6/atexit.py", line 24, in _run_exitfuncs
    func(*targs, **kargs)
  File "/usr/lib/python2.6/site-packages/yum/plugins.py", line 176, in run
    conduitcls = eval(conduitcls)       # Convert name to class object
MemoryError

ลองหมดแล้ววิธีที่มีสอนในกูเกิ้ลครับ ใครรู้วิธีแก้ช่วยหน่อยครับ