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Error rpmdb: Program version 4.2 doesn't match environment version

If you run yum update on your centOS and get an error like this:

rpmdb: Program version 4.2 doesn't match environment version
error: db4 error(22) from dbenv->open: Invalid argument
error: cannot open Packages index using db3 - Invalid argument (22)
error: cannot open Packages database in /var/lib/rpm

You can fix this eror with this command:

1. Check for processes holding the rpm database open:

lsof | grep /var/lib/rpm

If it finds any, kill -9 them all.

2. Delete any temporary DB files:

rm -fv /var/lib/rpm/__*

3. Rebuild your RPM database:

rpm --rebuilddb -v -v

If you still have problems, a reboot is probably quickest, then repeat steps 2 and 3 above.

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