How to rebuild or recover a corrupt RPM database.

Sometimes you may end up in a situation such as your rpm databases are corrupt. Don't get worried, we have an option to rebuild/recover the corrupt rpm databases.

You can follow the steps below but I am not giving any assurance that, this will solve all your problem on rpms.

First of  take a backup of rpm database directory. As we all know rpm database is located in  "/var/lib/", named as a directory "rpm".

Navigate to the location and tar the directory.

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cd /var/lib/
tar -cvzf rpmdb.tar.gz rpm.
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Now, lets remove rpm locks if present:
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cd /var/lib/rpm

rm -rf  __db*
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After that try rebuild:

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rpm --rebuilddb -vv
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Once the above command is executed, you should be able to do an yum update.

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 yum update
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Thats it :)