Thomas Kellerer <shammat@xxxxxxx> writes: > Tom Lane schrieb am 20.07.2020 um 20:04: >> Yeah, duplicate keys does seem odd here. Can you provide a self >> contained example? > I'll try, but this is a production system. > Extracting the necessary anonymous data will be tricky. If this is a PG bug, it should be possible to reproduce it with completely random/generated data. The key ingredient that you have and the rest of us don't is the process and timing by which the primary key values are introduced. > Is there any chance the version difference might cause this? > And a slightly outdated 11.x at that? Hmmm ... I do not recall any recent bug fixes that seem to match this symptom, but replication isn't a part of the code that I'm the world's best expert on. In any case, we do offer as standard advice that you should reproduce a problem on the latest minor release before filing a bug report. regards, tom lane