After more than 20 years working as a RACF administrator, a couple of years ago I achieved my own horror story:I deleted the active RACF databases (BOTH, PRIMARY and BACKUP), in a peak hour of the day...Details: We did recently migrate to a new z/OS version, and my intention was to delete the old RACF databases residing in the old volumes (their names were the same as the active ones). I listed them in 3.4, specifying VOLUME (because they were NOT cataloged), and then issued a DEL line command. As a result, I deleted the active ones!To be honest, I wasn't aware that a cataloged version on another volume may be deleted. A beginner mistake. Carefully looking again at what happened, I noticed that the DEL command issues the following caution alert (I didn't pay attention to it):<<< CAUTION: If TSO delete command was issued against an uncataloged data set, a cataloged version on a volume other than the one listed here may be deleted. >>>>> It was a tough day... Juan G. Mautalen
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