Eduardo Grosclaude wrote:

After some enabling/disabling new repos (pgdg for PostgreSQL specifically) and admittedly some yum action that may have gone uncompleted, I am advised to run yum-complete-transaction. However, when I attempt to do this, yum warns that 225 packages will be erased, all of which I deeply care for. How can I safely back out of this situation? Thank you in advance

Do an 'rpm -q packagename' for some or all of the packages in question to see if you have duplicates installed (or rpm thinks you do). I had this happen on one machine where yum crashed during the 5.3 upgrade and there really were many duplicates left in the rpm database and yum-complete-transaction did the right thing in removing them, even though it was bit scary to do remotely.