rpmdb panic - help?

[Marc M]

 What I would really like to understand is why this happenned.   Any
pointers?

[root at localhost ~]# yum update
rpmdb: PANIC: fatal region error detected; run recovery
error: db4 error(-30977) from dbenv->open: DB_RUNRECOVERY: Fatal error, run
database recovery
error: cannot open Packages index using db3 -  (-30977)
error: cannot open Packages database in /var/lib/rpm
Traceback (most recent call last):
  File "/usr/bin/yum", line 29, in ?
    yummain.main(sys.argv[1:])
  File "/usr/share/yum-cli/yummain.py", line 80, in main
    base.getOptionsConfig(args)
  File "/usr/share/yum-cli/cli.py", line 177, in getOptionsConfig
    self.doConfigSetup(fn=opts.conffile, root=root)
  File "/usr/lib/python2.4/site-packages/yum/__init__.py", line 102, in
doConfigSetup
    self.conf = config.readMainConfig(fn, root)
  File "/usr/lib/python2.4/site-packages/yum/config.py", line 589, in
readMainConfig
    vars['releasever'] = _getsysver(earlyconf.installroot,
earlyconf.distroverpkg)
  File "/usr/lib/python2.4/site-packages/yum/config.py", line 689, in
_getsysver
    idx = ts.dbMatch('provides', distroverpkg)
TypeError: rpmdb open failed
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