Massive CPU usage when updating Fedora using YUM/RPMQ
We noticed that YUM and RPMQ processes were using a massive amount CPU between them, the most likely the reason is that the rpm somehow hanged or was killed while it was running updating the system and left the repo info in an uncomplete state.
To fix:
su to root, go into /var/lib/rpm and see if there are any __db files (.001, .002 etc). Remove the files and kill all rpmq processes. It should be possible to update the system again after this. - http://www.rpm.org/hintskinks/repairdb/, http://forums.fedoraforum.org/showthread.php?t=141595
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