Don’t create so much expectations on this post.
This is because I don’t exactly fixed the issue, but workarounded…
The thing is: This error is caused in catalog database, so the workaround is simple: do a RMAN-nocatalog, I mean, simply don’t connect in catalog to perform the backup.
After completing the backup, I’d suggest you to force a synchronization with command “RESYNC CATALOG“. In worst case, on next execution the implicit resync will fix everything. 🙂
There is no bigger explanations on this, but you can same workaround in MOS Bug 12588237 – RMAN-3002 ORA-1: unique constraint (ckp_u1) violated after dataguard switchover (Doc ID 12588237.8).
And this is it for today!
See you next week!