andrijapanicsb commented on issue #3892: Add if not exists constraint to create 
table on upgrade paths
URL: https://github.com/apache/cloudstack/pull/3892#issuecomment-587892895
 
 
   To further explain myself - if you attempt the upgrade on top of DB which 
previously failed to be upgraded, you might end up with duplicate entries 
trying to be inserted and that would be chaos.
   The only "normal" way (acceptable in production) to proceed with the failed 
upgrade, is to start clean (drop DB, restore DB) and try again.

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